20 lbs in 30 days

So recently my roommate Cecily and I started Jillan Micheal's 30 day shed losing 20 lbs in 30 days and it has so far kicked our butts. And it got me thinking our family should do it to. So I think we should start a competiton whoever loses the weight ( 20 lb) in the time frame will win a $ 20 gift certificate of their choice and everyone participating will chip in. So far Sam, Simon, and I are in. Anyone else?