These tutorials may help you
Your step 1 is already included when Elgg is loaded. All you need to do is Copy the widget code (Step 2) to the content.php file of your widget.
Thx,
I havent started this project yet. But runkeeper has opened their Healtgraph API,
http://developer.runkeeper.com/healthgraph/getting-started
If someone wants to get me going on this and help me on the way I would much appreciate it.
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