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These exercise startups are sweating it out

A digital camera sees the world in three dimensions and follows the movement of the barbell the user is lifting. One important measure is velocity — the speed of each lift. The system can spot the difference between “strong and explosive” motions, or someone who is “barely completing his reps.” Future versions of Perch’s system, he says, will be able to track not just barbells but other items used in workouts, like medicine balls and kettle bells.

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