diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6cfe1c..e5f6361 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [0.3.0-beta] - 2021-07-21
 ### Added
  - Multiprocessing is here! The genetic optimization can now be run in parallel!
    Performances got improved by 65 % using 4 processes only.
@@ -15,6 +17,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  - The sidebar in the documentation a bit more useful.
  - Not having tqdm will cause an exception.
 
+### Fixed
+ - Corrected the example, the genetic optimization is now properly fixed but
+slower.
+
 ### Removed
  - native support for PyGAD is no longer present.
  - ``evolutionnary_optimization`` (replaced by ``evolutionary_optimization``).
diff --git a/docs/.buildinfo b/docs/.buildinfo
index 899c5b8..cab4e07 100644
--- a/docs/.buildinfo
+++ b/docs/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: 8fec30c6b948d6cd396c40a29450d753
+config: 16ebb9102fed1af2bd38eae4d81548ce
 tags: 645f666f9bcd5a90fca523b33c5a78b7
diff --git a/docs/_static/documentation_options.js b/docs/_static/documentation_options.js
index 1d49c69..dd5b32f 100644
--- a/docs/_static/documentation_options.js
+++ b/docs/_static/documentation_options.js
@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '0.2.0-alpha',
+    VERSION: '0.3.0',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/docs/api/dynamiclinkage.html b/docs/api/dynamiclinkage.html
index 905433f..6f5f8aa 100644
--- a/docs/api/dynamiclinkage.html
+++ b/docs/api/dynamiclinkage.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>dynamiclinkage &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>dynamiclinkage &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/api/geneticoptimizer.html b/docs/api/geneticoptimizer.html
index 5656214..8b42e49 100644
--- a/docs/api/geneticoptimizer.html
+++ b/docs/api/geneticoptimizer.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>geneticoptimizer &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>geneticoptimizer &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
@@ -622,6 +622,22 @@ <h1>geneticoptimizer<a class="headerlink" href="#geneticoptimizer" title="Permal
 </div>
 </dd></dl>
 
+<dl class="py function">
+<dt class="sig sig-object py" id="leggedsnake.geneticoptimizer.save_population">
+<span class="sig-prename descclassname"><span class="pre">leggedsnake.geneticoptimizer.</span></span><span class="sig-name descname"><span class="pre">save_population</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">file_path</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">population</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">verbose</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">data_descriptors</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#leggedsnake.geneticoptimizer.save_population" title="Permalink to this definition">¶</a></dt>
+<dd><p>Save the population to a json file.</p>
+<dl class="field-list simple">
+<dt class="field-odd">Parameters</dt>
+<dd class="field-odd"><ul class="simple">
+<li><p><strong>file_path</strong> (<em>str</em>) – </p></li>
+<li><p><strong>population</strong> (<em>list of dna</em>) – </p></li>
+<li><p><strong>verbose</strong> (<em>bool</em>) – </p></li>
+<li><p><strong>data_descriptors</strong> (<em>dict</em>) – Any additional value you want to save for the current generation.</p></li>
+</ul>
+</dd>
+</dl>
+</dd></dl>
+
 <dl class="py function">
 <dt class="sig sig-object py" id="leggedsnake.geneticoptimizer.select_parents">
 <span class="sig-prename descclassname"><span class="pre">leggedsnake.geneticoptimizer.</span></span><span class="sig-name descname"><span class="pre">select_parents</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pop</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">verbose</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">True</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#leggedsnake.geneticoptimizer.select_parents" title="Permalink to this definition">¶</a></dt>
diff --git a/docs/api/physicsengine.html b/docs/api/physicsengine.html
index 542d9b2..384ffe9 100644
--- a/docs/api/physicsengine.html
+++ b/docs/api/physicsengine.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>physicsengine &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>physicsengine &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/api/utility.html b/docs/api/utility.html
index d1465a9..3db501c 100644
--- a/docs/api/utility.html
+++ b/docs/api/utility.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>utility &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>utility &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/api/walker.html b/docs/api/walker.html
index ec4ec24..14d5d53 100644
--- a/docs/api/walker.html
+++ b/docs/api/walker.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>walker &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>walker &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/changeloglink.html b/docs/changeloglink.html
index 8db1805..2a873d8 100644
--- a/docs/changeloglink.html
+++ b/docs/changeloglink.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Changelog &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>Changelog &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
@@ -86,9 +86,11 @@
 <ul class="current">
 <li class="toctree-l1"><a class="reference internal" href="readmelink.html">Readme</a></li>
 <li class="toctree-l1 current"><a class="current reference internal" href="#">Changelog</a><ul>
-<li class="toctree-l2"><a class="reference internal" href="#unreleased">[Unreleased]</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="#unreleased">[Unreleased]</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#beta-2021-07-21">[0.3.0-beta] - 2021-07-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="#added">Added</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#changed">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#fixed">Fixed</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#removed">Removed</a></li>
 </ul>
 </li>
@@ -102,45 +104,45 @@
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-07-12">[0.1.4-alpha] - 2021-07-12</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="#id4">Added</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#id5">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#fixed">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id6">Fixed</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-07-10">[0.1.3-alpha] - 2021-07-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id6">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id7">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id8">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id7">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id8">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id9">Fixed</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-07-07">[0.1.2-alpha] - 2021-07-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id9">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id10">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id10">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id11">Fixed</a></li>
 <li class="toctree-l3"><a class="reference internal" href="#security">Security</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-06-26">[0.1.1-alpha] - 2021-06-26</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id12">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id12">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id13">Changed</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-06-25">[0.1.0-alpha] - 2021-06-25</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id13">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id14">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id15">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id16">Fixed</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-06-23">[0.0.3-alpha] - 2021-06-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id16">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id17">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id17">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id18">Fixed</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="#alpha-2021-06-22">[0.0.2-alpha] - 2021-06-22</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id18">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id19">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id20">Fixed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id19">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id20">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id21">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id21">[0.0.1-alpha] - 2021-06-22</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id22">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id22">[0.0.1-alpha] - 2021-06-22</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id23">Added</a></li>
 </ul>
 </li>
 </ul>
@@ -234,25 +236,38 @@ <h1>Changelog<a class="headerlink" href="#changelog" title="Permalink to this he
 and this project adheres to <a class="reference external" href="https://semver.org/spec/v2.0.0.html">Semantic Versioning</a>.</p>
 <div class="section" id="unreleased">
 <h2>[Unreleased]<a class="headerlink" href="#unreleased" title="Permalink to this headline">¶</a></h2>
+</div>
+<div class="section" id="beta-2021-07-21">
+<h2>[0.3.0-beta] - 2021-07-21<a class="headerlink" href="#beta-2021-07-21" title="Permalink to this headline">¶</a></h2>
 <div class="section" id="added">
 <h3>Added<a class="headerlink" href="#added" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Multiprocessing is here! The genetic optimization can now be run in parallel!
-Performances are easily improved by 30 % using 4 processes.</p></li>
+Performances got improved by 65 % using 4 processes only.</p></li>
 </ul>
 </div>
 <div class="section" id="changed">
 <h3>Changed<a class="headerlink" href="#changed" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
+<li><p>We now save data using JSON! Slow computer users, you can relax and stop
+computing when you want.</p></li>
 <li><p>The sidebar in the documentation a bit more useful.</p></li>
 <li><p>Not having tqdm will cause an exception.</p></li>
 </ul>
 </div>
+<div class="section" id="fixed">
+<h3>Fixed<a class="headerlink" href="#fixed" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Corrected the example, the genetic optimization is now properly fixed but
+slower.</p></li>
+</ul>
+</div>
 <div class="section" id="removed">
 <h3>Removed<a class="headerlink" href="#removed" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>native support for PyGAD is no longer present.</p></li>
-<li><p><code class="docutils literal notranslate"><span class="pre">evolutionnary_optimization</span></code> (replaced by <code class="docutils literal notranslate"><span class="pre">evolutionary_optimization</span></code>)</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">evolutionnary_optimization</span></code> (replaced by <code class="docutils literal notranslate"><span class="pre">evolutionary_optimization</span></code>).</p></li>
+<li><p>Data saved in the old txt format are no longer readable (were they?)</p></li>
 </ul>
 </div>
 </div>
@@ -319,8 +334,8 @@ <h3>Changed<a class="headerlink" href="#id5" title="Permalink to this headline">
 leggedsnake 0.1.4.</p></li>
 </ul>
 </div>
-<div class="section" id="fixed">
-<h3>Fixed<a class="headerlink" href="#fixed" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id6">
+<h3>Fixed<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>The full swarm representation in polar graph has been repaired in
 <code class="docutils literal notranslate"><span class="pre">docs/examples/strider.py</span></code>.</p></li>
@@ -334,8 +349,8 @@ <h3>Fixed<a class="headerlink" href="#fixed" title="Permalink to this headline">
 <div class="section" id="alpha-2021-07-10">
 <h2>[0.1.3-alpha] - 2021-07-10<a class="headerlink" href="#alpha-2021-07-10" title="Permalink to this headline">¶</a></h2>
 <p>This package was lacking real documentation, it is fixed in this version.</p>
-<div class="section" id="id6">
-<h3>Added<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id7">
+<h3>Added<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Sphinx documentation!</p></li>
 <li><p>Website hosted on GitHub pages, check
@@ -343,8 +358,8 @@ <h3>Added<a class="headerlink" href="#id6" title="Permalink to this headline">¶
 <li><p>Expanded README with the quick links section.</p></li>
 </ul>
 </div>
-<div class="section" id="id7">
-<h3>Changed<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id8">
+<h3>Changed<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Tests moved from <code class="docutils literal notranslate"><span class="pre">leggedsnake/tests</span></code> to <code class="docutils literal notranslate"><span class="pre">tests/</span></code>.</p></li>
 <li><p>Examples moved from <code class="docutils literal notranslate"><span class="pre">leggedsnake/examples/</span></code> to <code class="docutils literal notranslate"><span class="pre">docs/examples/</span></code>.</p></li>
@@ -353,8 +368,8 @@ <h3>Changed<a class="headerlink" href="#id7" title="Permalink to this headline">
 inconvenience!</p></li>
 </ul>
 </div>
-<div class="section" id="id8">
-<h3>Fixed<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id9">
+<h3>Fixed<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>A lot of outdated code in the <code class="docutils literal notranslate"><span class="pre">leggedsnake/examples/strider.py</span></code></p></li>
 <li><p>Changelog URL was broken in <code class="docutils literal notranslate"><span class="pre">setup.cfg</span></code>.</p></li>
@@ -363,8 +378,8 @@ <h3>Fixed<a class="headerlink" href="#id8" title="Permalink to this headline">¶
 </div>
 <div class="section" id="alpha-2021-07-07">
 <h2>[0.1.2-alpha] - 2021-07-07<a class="headerlink" href="#alpha-2021-07-07" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id9">
-<h3>Changed<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id10">
+<h3>Changed<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>The <code class="docutils literal notranslate"><span class="pre">step</span></code> function execution speed has been increased by 25% when
 <code class="docutils literal notranslate"><span class="pre">return_res</span></code> is <code class="docutils literal notranslate"><span class="pre">True</span></code>! Small performance improvement when <code class="docutils literal notranslate"><span class="pre">return_res</span></code>
@@ -373,8 +388,8 @@ <h3>Changed<a class="headerlink" href="#id9" title="Permalink to this headline">
 <li><p>We now require pylinkage&gt;=0.4.0.</p></li>
 </ul>
 </div>
-<div class="section" id="id10">
-<h3>Fixed<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id11">
+<h3>Fixed<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Files in <code class="docutils literal notranslate"><span class="pre">leggedsnake/examples/</span></code> were not included in the PyPi package.</p></li>
 <li><p>The example was incompatible with pylinkage 0.4.0.</p></li>
@@ -392,8 +407,8 @@ <h3>Security<a class="headerlink" href="#security" title="Permalink to this head
 </div>
 <div class="section" id="alpha-2021-06-26">
 <h2>[0.1.1-alpha] - 2021-06-26<a class="headerlink" href="#alpha-2021-06-26" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id11">
-<h3>Added<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id12">
+<h3>Added<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>The example file <code class="docutils literal notranslate"><span class="pre">examples/strider.py</span></code> is now shipped with the Python
 package.</p></li>
@@ -401,8 +416,8 @@ <h3>Added<a class="headerlink" href="#id11" title="Permalink to this headline">
 built-in GA algorithm if PyGAD is not installed.</p></li>
 </ul>
 </div>
-<div class="section" id="id12">
-<h3>Changed<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id13">
+<h3>Changed<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p><code class="docutils literal notranslate"><span class="pre">setup.cfg</span></code> metadata</p></li>
 </ul>
@@ -410,23 +425,23 @@ <h3>Changed<a class="headerlink" href="#id12" title="Permalink to this headline"
 </div>
 <div class="section" id="alpha-2021-06-25">
 <h2>[0.1.0-alpha] - 2021-06-25<a class="headerlink" href="#alpha-2021-06-25" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id13">
-<h3>Added<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id14">
+<h3>Added<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Code vulnerabilities automatic checks</p></li>
 <li><p>Example videos in <code class="docutils literal notranslate"><span class="pre">examples/images/</span></code></p></li>
 </ul>
 </div>
-<div class="section" id="id14">
-<h3>Changed<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id15">
+<h3>Changed<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Manny reforms in code style, to make the dynamic part naming conventions
 consistent with Pymunk.</p></li>
 <li><p>Images in the <code class="docutils literal notranslate"><span class="pre">README.md</span></code>!</p></li>
 </ul>
 </div>
-<div class="section" id="id15">
-<h3>Fixed<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id16">
+<h3>Fixed<a class="headerlink" href="#id16" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>You can now define linkages with an enormous number of legs. Systems with
 many should no longer break physics but your CPU instead :)</p></li>
@@ -435,15 +450,15 @@ <h3>Fixed<a class="headerlink" href="#id15" title="Permalink to this headline">
 </div>
 <div class="section" id="alpha-2021-06-23">
 <h2>[0.0.3-alpha] - 2021-06-23<a class="headerlink" href="#alpha-2021-06-23" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id16">
-<h3>Added<a class="headerlink" href="#id16" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id17">
+<h3>Added<a class="headerlink" href="#id17" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Started walktrough demo in <code class="docutils literal notranslate"><span class="pre">README.md</span></code></p></li>
 <li><p>Automatic release to PyPi</p></li>
 </ul>
 </div>
-<div class="section" id="id17">
-<h3>Fixed<a class="headerlink" href="#id17" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id18">
+<h3>Fixed<a class="headerlink" href="#id18" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Pymunk version should be at least 6.0.0 in requirement files.</p></li>
 <li><p>Some URLs typos in <code class="docutils literal notranslate"><span class="pre">README.md</span></code></p></li>
@@ -453,14 +468,14 @@ <h3>Fixed<a class="headerlink" href="#id17" title="Permalink to this headline">
 </div>
 <div class="section" id="alpha-2021-06-22">
 <h2>[0.0.2-alpha] - 2021-06-22<a class="headerlink" href="#alpha-2021-06-22" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id18">
-<h3>Added<a class="headerlink" href="#id18" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id19">
+<h3>Added<a class="headerlink" href="#id19" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p><code class="docutils literal notranslate"><span class="pre">requirement.txt</span></code> was absent due to <code class="docutils literal notranslate"><span class="pre">.gitignore</span></code> misconfiguration.</p></li>
 </ul>
 </div>
-<div class="section" id="id19">
-<h3>Changed<a class="headerlink" href="#id19" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id20">
+<h3>Changed<a class="headerlink" href="#id20" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p><code class="docutils literal notranslate"><span class="pre">.gitignore</span></code> now ignores .txt files only in the leggedsnake folder.</p></li>
 <li><p><code class="docutils literal notranslate"><span class="pre">environment.yml</span></code> more flexible (versions can be superior to the selected).
@@ -469,20 +484,20 @@ <h3>Changed<a class="headerlink" href="#id19" title="Permalink to this headline"
 encapsulation.</p></li>
 </ul>
 </div>
-<div class="section" id="id20">
-<h3>Fixed<a class="headerlink" href="#id20" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id21">
+<h3>Fixed<a class="headerlink" href="#id21" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p><code class="docutils literal notranslate"><span class="pre">setup.cfg</span></code> was not PyPi compatible. Removed mail (use GitHub!), we now
 explicitly say that <code class="docutils literal notranslate"><span class="pre">README.md</span></code> is markdown (PyPi is conservative)</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id21">
-<h2>[0.0.1-alpha] - 2021-06-22<a class="headerlink" href="#id21" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id22">
+<h2>[0.0.1-alpha] - 2021-06-22<a class="headerlink" href="#id22" title="Permalink to this headline">¶</a></h2>
 <p>Basic version, supporting Genetic Algorithm optimization, but with various
 problems.</p>
-<div class="section" id="id22">
-<h3>Added<a class="headerlink" href="#id22" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id23">
+<h3>Added<a class="headerlink" href="#id23" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p><code class="docutils literal notranslate"><span class="pre">CODE_OF_CONDUCT.md</span></code> to help community.</p></li>
 <li><p><code class="docutils literal notranslate"><span class="pre">LICENSE</span></code> MIT License.</p></li>
diff --git a/docs/examples/strider.py b/docs/examples/strider.py
index de1b08c..0a27a8c 100644
--- a/docs/examples/strider.py
+++ b/docs/examples/strider.py
@@ -588,8 +588,8 @@ def show_optimized(linkage, data, n_show=10, duration=5, symmetric=True):
         optimized_striders[0][0]
     )
 )
-#show_optimized(strider, optimized_striders)
-#ls.show_linkage(strider, save=False, duration=10, iteration_factor=n)
+show_optimized(strider, optimized_striders)
+ls.show_linkage(strider, save=False, duration=10, iteration_factor=n)
 # We add some legs
 strider.add_legs(3)
 init_coords = strider.get_coords()
diff --git a/docs/genindex.html b/docs/genindex.html
index 6a7a475..a635c9c 100644
--- a/docs/genindex.html
+++ b/docs/genindex.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Index &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>Index &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
@@ -517,6 +517,8 @@ <h2 id="R">R</h2>
 <h2 id="S">S</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="api/geneticoptimizer.html#leggedsnake.geneticoptimizer.save_population">save_population() (in module leggedsnake.geneticoptimizer)</a>
+</li>
       <li><a href="api/geneticoptimizer.html#leggedsnake.geneticoptimizer.select_parents">select_parents() (in module leggedsnake.geneticoptimizer)</a>
 </li>
       <li><a href="api/dynamiclinkage.html#leggedsnake.dynamiclinkage.DynamicPivot.set_anchor_a">set_anchor_a() (leggedsnake.dynamiclinkage.DynamicPivot method)</a>
@@ -527,14 +529,14 @@ <h2 id="S">S</h2>
         <li><a href="api/dynamiclinkage.html#leggedsnake.dynamiclinkage.PinUp.set_anchor_a">(leggedsnake.dynamiclinkage.PinUp method)</a>
 </li>
       </ul></li>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="api/dynamiclinkage.html#leggedsnake.dynamiclinkage.DynamicPivot.set_anchor_b">set_anchor_b() (leggedsnake.dynamiclinkage.DynamicPivot method)</a>
 
       <ul>
         <li><a href="api/dynamiclinkage.html#leggedsnake.dynamiclinkage.PinUp.set_anchor_b">(leggedsnake.dynamiclinkage.PinUp method)</a>
 </li>
       </ul></li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="api/physicsengine.html#leggedsnake.physicsengine.set_space_constraints">set_space_constraints() (in module leggedsnake.physicsengine)</a>
 </li>
       <li><a href="api/dynamiclinkage.html#leggedsnake.dynamiclinkage.DynamicLinkage.space">space (leggedsnake.dynamiclinkage.DynamicLinkage attribute)</a>
diff --git a/docs/index.html b/docs/index.html
index b243f86..f75df4e 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Welcome to LeggedSnake’s documentation! &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>Welcome to LeggedSnake’s documentation! &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
@@ -182,6 +182,7 @@ <h1>Welcome to LeggedSnake’s documentation!<a class="headerlink" href="#welcom
 </li>
 <li class="toctree-l1"><a class="reference internal" href="changeloglink.html">Changelog</a><ul>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#unreleased">[Unreleased]</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changeloglink.html#beta-2021-07-21">[0.3.0-beta] - 2021-07-21</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-07-14">[0.2.0-alpha] - 2021-07-14</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-07-12">[0.1.4-alpha] - 2021-07-12</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-07-10">[0.1.3-alpha] - 2021-07-10</a></li>
@@ -190,7 +191,7 @@ <h1>Welcome to LeggedSnake’s documentation!<a class="headerlink" href="#welcom
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-06-25">[0.1.0-alpha] - 2021-06-25</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-06-23">[0.0.3-alpha] - 2021-06-23</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changeloglink.html#alpha-2021-06-22">[0.0.2-alpha] - 2021-06-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changeloglink.html#id21">[0.0.1-alpha] - 2021-06-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changeloglink.html#id22">[0.0.1-alpha] - 2021-06-22</a></li>
 </ul>
 </li>
 </ul>
diff --git a/docs/objects.inv b/docs/objects.inv
index aa240e4..0d16ad9 100644
Binary files a/docs/objects.inv and b/docs/objects.inv differ
diff --git a/docs/py-modindex.html b/docs/py-modindex.html
index d21ba5b..5cc8753 100644
--- a/docs/py-modindex.html
+++ b/docs/py-modindex.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Python Module Index &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>Python Module Index &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/readmelink.html b/docs/readmelink.html
index 9c06fa3..b61a875 100644
--- a/docs/readmelink.html
+++ b/docs/readmelink.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>leggedsnake &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>leggedsnake &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/search.html b/docs/search.html
index b03302d..93dacec 100644
--- a/docs/search.html
+++ b/docs/search.html
@@ -8,7 +8,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Search &mdash; LeggedSnake 0.2.0-alpha documentation</title>
+  <title>Search &mdash; LeggedSnake 0.3.0 documentation</title>
   
 
   
diff --git a/docs/searchindex.js b/docs/searchindex.js
index 6dcbe2f..f61ffe6 100644
--- a/docs/searchindex.js
+++ b/docs/searchindex.js
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/leggedsnake/__init__.py b/leggedsnake/__init__.py
index 49e309c..74d906d 100644
--- a/leggedsnake/__init__.py
+++ b/leggedsnake/__init__.py
@@ -36,4 +36,4 @@
     World, VisualWorld
 )
 
-__version__ = "0.2.0"
+__version__ = "0.3.0"
diff --git a/setup.cfg b/setup.cfg
index 40fb33c..560057e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.2.0
+current_version = 0.3.0
 commit = False
 tag = False
 
@@ -46,5 +46,5 @@ search = __version__ = "{current_version}"
 replace = __version__ = "{new_version}"
 
 [bumpversion:file:source/conf.py]
-search = release = '{current_version}-alpha'
-replace = release = '{new_version}-alpha'
+search = release = '{current_version}'
+replace = release = '{new_version}'
diff --git a/source/conf.py b/source/conf.py
index aac9018..ab76e95 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -22,7 +22,7 @@
 author = 'Hugo Farajallah'
 
 # The full version, including alpha/beta/rc tags
-release = '0.2.0-alpha'
+release = '0.3.0'
 
 
 # -- General configuration ---------------------------------------------------