Put to the test: do fitness bands work?

So many people have hopped onto the "fitness band" wagon, ABC News decided to put them to the test.
The wearable tech gadgets are all the rage for those who want to keep close tabs on their health. Fitness bands can track how much they're moving, eating, and how well they're sleeping. They range from $100-$200.
The results of the test may surprise you!
Watch the video in the player above. 
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