Digital Trends – Designed by a couple recent Harvard grads, GymPact is a service that encourages people to make it into the gym by linking performance to money according to ABC News. Currently limited to iPhone owners, users sign up for the service through the GymPact application and decide how many days per week that they would like to exercise. The app allows the user to âcheck-inâ to the gym similar to Foursquare and the minimum amount of time that qualifies for a check-in at the gym is 30 minutes. GymPact currently has about 40,000 gyms in the database, but a user can add a new gym by âchecking inâ during a 30 minute workout.