We found the best way to fire up your lower body during a push-up

We found the best way to fire up your lower body during a push-up. Here's how to perform TRX push-ups to reap the muscle-building benefits.

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Photo: <a href="http://www.stocksy.com" target="_blank">Stocksy</a>/Guille Faingold

The Surprising Way to Strengthen Your Hip Joint, According to Experts

Hint: Giving that ball and socket some love doesn't always mean more stretching.