You can go here to get started with the API. Once you get signed up they have a nice tool that you can use to test the API and pull back real data.
Here is what the tool looks like:
The idea of this demo is to show you how to create the visualizations rather than showing you how to use an API from within your app. So, we will be using this tool to pull back the data. For this demo we will be using the data from one workout.
Here is a screenshot of the tool in action:
The finished product looks like this:
You can view a live demo here. Try dragging the yellow guy onto the map to check out the street view.
Of course you can just sign up for a MapMyRun MVP account and see these visualizations and more, but where would be the fun in that? I hope you have enjoyed learning about these APIs and the cool stuff you can do with them.