Have you ever seen two people who were both 60 years old but one of them looks 70 and the other looks 45? Age can't be measured by the calendar alone. There are several well established "bio markers of aging" that are used to give more accuracy to the assessment of physical age. Guess what? The amount of muscle your body contains is one of the principle bio markers of aging. The more muscle you have, the younger you are. Another bio marker of aging is bone density. Guess what the number one method is of increasing bone density? Heavy, weight bearing exercise!
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