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Ivonne Wierink CNN anchor Anderson Cooper once likened getting gray hairs at a young age to premature ejaculation: “You know it can happen prematurely, but when it actually does, it's a total shock.” Cooper has proudly rocked his salt-and-pepper locks since he was about 20. But let’s face it...

Nestor Rizhniak / Shutterstock In most beginner exercise textbooks, it’s common to prescribe multi-joint movements (i.e. squats, bench press, deadlifts, etc.) at the start of your workout, and follow with isolation-type exercises (e.g. biceps curls, leg curls, triceps extensions, etc.). In the...