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CES 2016 has been a showcase for specialized fitness trackers beyond the usual step and heart-rate monitoring. The Skulpt Chisel, a $99 handheld device that measures your body fat and muscle quality (that’s a real scientific term), is meant to monitor your results and progress more than your training. Body fat percentage is one of the better indicators of overall fitness – much better than the utterly useless BMI (body-mass index) – and an important metric if you’re trying to lose weight healthily or build muscle without becoming gaining too much fat. Problem is, it’s really hard to measure accurately. Online calculators can be off by…

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