Weight Wager: Win Money Weekly, Losing Weight
https://www.weightwagerapp.com/
Every Monday, American weight loss competitors step onto their scales and sync their weigh-ins into a weight loss leaderboard. Competitors make a weekly bet that they will lose 1lb. Competitors that gain weight or don't lose the full 1lb, pay that bet. Those that lose weight win.
Note: It views / renders best on a laptop or desktop browser right now. Still working on the mobile / tablet / phone versions of the landing page.