The 6 Fitness Trackers to Buy Now

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Best for Gym Workouts

Best for Gym Workouts

Gymwatch Sensor

Gymwatch turns your phone into a personal trainer. Place sensors on your thigh, biceps, or both (one is included: an extra is $150) and it will count your reps and sets (but not heart rate). It will even critique your form for over 900 moves. [$150;]

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