Interesting. I'm not motivated enough by alpha-male competitiveness to want to use this, but I like that Fitocracy is building out their feature set.
Fitocracy's new PVP challenges are, for the time being, limited to premium "Hero" accounts, although a Hero can challenge anyone to a duel. The new PvP system compliments the group challenges that already exist, where teams of Fitocracy subscribers can compete with other groups to get to certain milestones first, earn a certain number of points, or collectively complete different exercise or activity goals.
Fitness tracking site Fitocracy is a great webapp to track your fitness, log how many calories you burn every day, get help and motivation from others, and even turn getting in shape into a game that ...