
Fitocracy is out to try and prove that fitness can be fun, challenging and addictive.
Currently Fitocracy is still in beta mode and joining requires an invite. If you'd like an invite you can search Google for one, email Fitocracy at info@fitocracy.com or leave your email address in the comments and I can send you one of my 8 remaining invites.
http://www.fitocracy.com