hey - so had a thought on what the chart should do when clicked and didn't come up with anything really interesting. Thought a modal window with the stats for that day (comparing to running avg for previous week) would be the most intuitive thing, though it isn't all that exciting.

The only other thing that came to mind that was interesting was to give me a sense of how far I had come. For instance, the chart on the front page shows 300 miles. If I was walking from SF to LA how far down would I be? I ride a stationary bike most mornings and that is how I relate to how far I've been. It's fun, and easy measure and make me feel awesome knowing how close I'm getting to the other end!