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At what age does exercise become difficult? A look at physiological and motivational changes

According to the USDA, people typically start to lose muscle mass and strength at a rate of 0.5 to 1% per year after about age 35. This physiological change is one of many factors contributing to the common question: at what age does exercise become difficult? While there is no single answer, understanding how the body changes can help everyone stay active and healthy for longer.