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Many think of exercise as the solution for all of their health woes—even those related to the aging process. Of course, no amount of physical activity can stop us from getting older, but there's plenty of evidence that proves that physical activity can increase life expectancy by limiting the development and progression of chronic diseases—something many folks start thinking about after they turn 40.

"There comes a point when we realize we're no longer invincible," says Holly Perkins, a personal trainer. "Believe it or not, the body starts to decline after about 30, and that decline gets more aggressive every year." The good news: Exercise not only helps you feel (and look!) better, it can also slow that decline, helping you stave off some common health conditions.

Here, five exercises you should start doing every week once you're in your 40s to stay healthy, happy, and looking as great as you feel.

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