A contest for maintaining?

At my gym, they are running a weight loss competition (this Biggest Loser-esque).

Recently, the topic of "maintenence has come up.  Several people have done the contest and hit their goals, but now they still want the accountability that the contest afforded them.

I'm looking for ideas... what would a "maintenence" contest look like?  Prizes couldn't be awarded for % of weight lost (what the other contest does), so how would you measure "success" in maintenence, in addition to just keeping the weight off?

Anybody have any creative ideas?

Thanks in advance!

do a contest to see if you can maintain your weight through christmas or who can go the longest without the scale showing your more then 2 pound over your weight (so you would have to watch sodium and all that as well so that it doesnt fluctuate much) for every month of staying at the goal weight you get some kind of treat (go out for a drink, manicure/pedicure, a new clothes item etc) or you could do who can lose the most cm off their waist, thighs, back - whatever while maintaining the same weight - ie just toning up but doing so without gaining weight.

ok im out of ideas, goodluck with this quest

Thanks for your reply!

I'm thinking of a point system... like,
a point for every class you take at the gym,
for each class you attend from the regular weight loss challenge (the thin people can help motivate the newbies, I figure),
a point each week that you lose or maintain (coach signature required),
and maybe a point for using the nautilus room...

Does this sound good?  I think the gym might gift some free memberships to the winners.

sounds like a good idea, would you also deduct points if the individual puts on weight? might help make the individual also accountable for any weight gain - apart rfom the obvious and an insentive to lose the additional weight