online competition website track weight AND body fat

My family and I are doing a weight loss competition online. We've previously done one registering with SkinnyYo however not all of our participants have a significant amount to lose. We thought it would be more fair to have the prize go to the person with the highest percentage of weight lost AND the highest percentage of body fat. Does any one know of a competition site that can track both? Or should we just manually enter the body fat?

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