Jeff Hill is counting his steps — all 20,000 of them. With his Garmin Vivofit around his wrist, Hill wakes up at the crack of dawn, around 4 or 5 a.m. He walks to the Bonneville Shoreline trail to ...
Wearable tracker maker Mio Global has a new fitness metric called Personal Activity Intelligence based on your unique heart rate data. Personal tech columnist Geoffrey A. Fowler takes PAI for a ...
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