title: How do I retrieve step count data from Google Fitness REST api?
body: <p>Since I installed the Google Fit app on my Nexus 5 it has been tracking my step count and time spent walking. I'd like to retrieve this info via the Google Fitness REST api (<a href="https://developers.google.com/fit/rest/" rel="noreferrer">docs</a>) but I can't work out how to get any of that data from the REST api.</p>
  
  <p>I've used the OAuth 2.0 playground to successfully list dataSources but none of the examples I have tried have returned any fitness data whatsoever. I feel like I need to use something similar to a DataReadRequest from the (<a href="http://developer.android.com/reference/com/google/android/gms/fitness/request/DataReadRequest.html" rel="noreferrer">Android SDK</a>) but I'm not building an Android app -- I just want to access fitness data already stored by the Google Fit app.</p>
  
  <p>Is it even possible to get the data gathered by the Google Fit app? If so, how can I read and aggregate step count data using the REST api?</p>