Somone I know works for this startup:
Plus 3 Network
It's a social networking site that allows those of us that exercise to raise money for charitable causes at the same time. Signing up is free and the results are cool.
If you regularly walk, ride, run, hike, do yoga, or any of a number of other activities, you can raise money for a good cause simply by logging your workouts.
Check it out, and if you sign up search for me on the site and we'll connect, something like Facebook's friend concept. That way we can watch each other's workouts and encourage each other along the way.