Love the idea of a biggest loser competition at home! When I saw this thread, I remembered this article that appeared in our newspaper recently.........all about different groups (like a group of staff members at a local school) who started biggest loser clubs of their own. Take a look if you're interested:

http://www.orlandosentinel.com/community/news/doctorphillips/orl-bigloser08jun10,0,868546.story
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Ann