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GymPact, based in San Francisco, California, sets a committment for you to go to the gym — with a financial penalty if you don't get there. If you meet your committment, you get a financial reward.
Your penalties go towards paying other GymPact members that meet their exercise commitments. It is integrated with Runkeeper for when you excercise outside.
Founders Yifan Zhang and Geoff Oberhofer secured $118,000 funding in January 2012, with a further $850,000 in June 2012.