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For bodybuilders and fitness enthusiasts, changing body composition often reflects hard work and discipline—but knowing body composition is useful for anyone, and for more than just bragging rights.

Many people dread stepping onto the bathroom scale. It can be very frustrating to exercise and eat a healthy diet only to see the number on the scale stay the same. However, just because your body ...

Thanks to the ever-improving world of fitness trackers and apps, you've never had more access to personal health data. But which of the dizzying number of markers and metrics should you really be ...