A new concept gym uses behavioral economics to change how and when members pay to workout.

A new fitness concept developed by two Harvard economics students, Yifan Zhang and Geoff Oberhofer, leans heavily on behavioral economics to motivate its members to workout. The concept, Gym-Pact, employs what Zhang calls “motivational fees” —  members pay more money when they do not exercise.

The students are trying to tackle a particular economic challenge: because gym fees are paid upfront, there is little future economic penalty for not working out. In effect, you’ve already paid the maximum economic penalty.

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