I recently joined Fitocracy and found it to be a great points-based system that I've found to be a great way to motivate myself to increase my fitness level, and really helpful when tracking PRs. Their exercise database is the best I've ever seen, and I've been a member of a number of different fitness- and diet-tracking websites in the past five years or so. They also have "challenges" that suggest circuit-like exercise sequences to do for extra points.

There's also a PB group that is only mildly active, so I'm curious if anybody here in the forums is on there or if anybody was thinking about trying out Fitocracy.

Anyone? Beuller?