Staying fit in your 50s, 60s and beyond is all about feeling strong and capable, even as muscle loss naturally creeps in. The good news is that with the right approach, you can keep that strength for the long haul.

Trainer Eric North knows this better than anyone. At 61, he trains with a level of energy most people would love to tap into, and he has built a following as the Happiness Warrior by sharing exactly how he does it.

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