you might want to suggest
Free Diet Plans at SparkPeople to your company -it's a free site, and you could create your own challenges within them...

a few companies i think have done this...
we have regular challenges here - you might want to check that forum for ideas...
and have fun with it - nice to see your company getting involved and booo on thenaysayers - they'll be sorry in the long run

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Motivation is not something you find or lose, have or don't have. It is the product of how you see yourself in the world: active or passive, effective or ineffective, powerful or victimized, normal or pathological.