Less wrong has a fitocracy group (invites)

Fitocracy is a fitness gamification social site for logging and tracking workouts. It has an RPG like system with quests and leveling up. It makes it very easy to make public commitments to a workout plan and provide each other with motivation and advice.

I shouldn’t really have to go over why you need to be working out if you plan on living until the singularity :)

http://​​ftcy.co/​​vMOYfA