A few people in our family have decided to start our own biggest loser competition. We all weighed in on the 1st, put in $25 and are weighing in again on Sept.1. Biggest % of weight lost wins.
It is only 5 of us so it's $100 if we win plus our initial $25 back, but it is a fun incentive, not even just for the money, but for bragging rights.
Has anyone ever done this? I hear offices and gyms do it too, but I don't work and I don't think my gym has done it.