&gt; Do you have a database of walking styles? Does anybody?<p>I nearly always walk around with a 3-d accelerometer which can indeed &quot;phone&quot; home.<p>Here&#x27;s the ML extraction mechanism as explained by a Samsung engineer - <a href="http:&#x2F;&#x2F;www.slideshare.net&#x2F;satnam74&#x2F;the-fifth-elephant-2013-talk-smart-ana&#x2F;8" rel="nofollow">http:&#x2F;&#x2F;www.slideshare.net&#x2F;satnam74&#x2F;the-fifth-elephant-2013-t...</a>