GymPact

You tell us how many days a week you want to exercise (min 1 day/week) and set the monetary stakes you’ll pay if you don’t go (min $5 per day missed).

Be part of a fun, social and real way to get yourself to the gym. Getting started is easy – Join today!

Interesting idea but with 90% (according to GymPact) of people making their gym commitments, the 'payout' would be tiny! I think this would work better if you could make the pact with only your circle of friends.