Fitocracy is a website and social community thing wherein you exercise, input your activities into the website, and earn points. You can level up, complete quests and earn achievements. It was created by some gamers who liked to exercise. You can compete with others, compete with yourself, and join fun groups. (My fav so far is "Getting Fit for the Zombie Apocalypse".)
I started a group on there called "Fit and Spiritual" and it turns out if you start a group you totally get a bunch more invites - I think, if I'm wrong then sorry! - so I am posting the link here for anyone who hasn't already joined and would like to. Take a look at the site and if it looks like your sort of thing, come and join us by clicking the link below.