Personal Trainer, Worn on a Wrist by JENNA WORTHAM

by Derek McKinney | Posted on


By JENNA WORTHAM

The Force, new from Fitbit, opens a window on your exercise habits. But it still requires a good bit of work from you.

Published: January 30, 2014 at 12:00AM

from NYT Technology http://nyti.ms/Lq2mW4
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