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Which is? An armband that accurately tracks your fitness wherever you go

What they say? Designed to sync with a website that aggregates data, the BodyMedia FIT system gives you highly accurate information on activity, calories and sleep patterns. Clinical studies show that this armband can improve weight loss by up to three times.

What we say? “Being a type A personality, I’m mad for a metric. Seeing my sleep, calories in and out, and activity was a great motivator to eat clean and move more (and we hate to think what the FIT coach feature would say about an all-nighter). The results, particularly for sleep, are impressively accurate.”