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If there’s a magic pill for staying youthful, it may be one that’s hard to swallow: exercise. Daily doses have been proven to thwart a number of aging factors — stress, obesity, heart disease, diabetes — and the longer you’re physically active, the less you’ll notice getting older.

Weight training is good at any age.

The catch is that a 50-year-old’s body is not the same as a 20-year-old’s; you can’t push it the same way you once did, nor should you if you want to keep it in working-out order.

So listen to these coaches — they’re talking not just professionally but also firsthand — on how to remain fit, and proud of it, through the decades.

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