In the same way that one adds money to a sweat jar when a curse word has been spoken, Lazy Jar is an app that has users pay for failing to meet their fitness goals.
The aim of the Fitbit-connected application is to help users build discipline, but do so in a way that is based on negative reinforcement than providing positive incentives. Lazy Jar has app users set a weekly goal, as well as a penalty for failing to fulfil that goal. To help users devote themselves fully to the cause, the app has users make a security deposit that will be refunded after a six-month commitment period.
As far as the money that goes to Lazy Jar from missed physical activity sessions, it donates 80% to charity and uses the rest for the upkeep of the app.