I saw this on another 3FC forum, and I liked it a lot. The poster and a friend don't attend Weight Watcher meetings, but they put the money they would have spent going to a WW meeting into a jar each week before they weigh in. When they reach their goal weights, then they get to spend the money.
I need the support of going to meetings so I plan to continue paying WW that money, but I think it's a great idea for people who don't want to attend meetings. I don't want to even think of how much money I'd have in that jar before I hit my goal weight!
I'd put it in a money market account, though, to get the interest.