At my job we have a Biggest Loser contest. We pay $20 to join & weigh in every 2 weeks. If you gain, you have to pay in $5 that week. At the end, the top 2 (by percentage lost) take home the $ prizes. Last year, Jan-July I lost 34lbs & got 2nd place. Then Aug-Nov, I lost another 29lbs & got 1st!