My brothers and I do a family biggest loser. The first time we put $100 in each. If we lost 10% body weight in 3 months then we get $50 back, and the rest goes to the overall biggest loser. I only lost 5%, so I lost the whole $100 dollars....but it was definitely and incentive to lose, and if I hadnt had the competition and money at stake, I may not have even lost 12lbs. We started a new round, this time only putting $50 in
So far so good!! I think the motivation works!!