There actually is a program you can do for this, it's called weight loss bet. I've done it before and "won" $180 against the people I was competing against. I

There actually is a program you can do for this, it's called weight loss bet. I've done it before and "won" $180 against the people I was competing against. It's very motivational imo, you can choose either to compete against randoms or people you know. We did a pool from work.