Commitment device app that works on a dead man's switch. The idea is to use the discipline you have now to discipline your future self.

eg1 - Enter your weight every month. If you go over a predetermined weight, it does something punitive. Posts embarrassing pictures online, emails your mom, donates $50 to the Klu klux Klan.

eg2 Create a todo list with due dates, goals or somesuch. Failing to complete them does something punitive.

eg3 Create out a challenge (exercise 5 times per week). Failure to complete challenge does something punitive.

The key is to get the psychological component right. I think if someone's daily task is 100 or more pushups they are more likely to fraudulently push a complete button than they are to enter a fraudulent number of pushups.

Could be a fun project.