I've been using the Dietbet app to lose weight. You join a bet, pay a fee, weigh in at the beginning and then weigh in again at the end. If you hit percentage weight loss goal, you get a cut of the total pot.
They have different time lengths for the challenges. I've done a 30 day challenge and a six month one last year where your weigh in every month. Won $150 for the six month one.
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