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 :)
I am already a Fitocracy member so I can't use the invite code, right? I'd still join the LW group on Fitocracy - but I couldn't find it in a search. Can you say what the name of the group is?
"less wrong" with the space. also make sure you're on the group page when you search. the normal search only works for usernames.