Can a Gadget Replace Your Personal Trainer?

A new generation of fitness wearables aims to go beyond data tracking and actually tell you what to do.

A new generation of fitness gadgets is just starting to reach consumers, and they do so much more than track your activity -- they actually tell you what to do, just like a personal trainer. This week, Bloomberg Technology's Aki Ito 
tests 17 devices and sees if any of them are as good as the real thing: working out with a human trainer. 

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