I totally agree that some moderate regular exercise is extremely beneficial for both mind and body. Moderate exercise has been shown to benefit the heart and movement helps keep joints supple and mobile. I somewhat disagree with exercises that can do damage though, such as lifting heavy weights, pounding the pavements stressing knee joints, and playing golf which in time can harm hip joints because of the unnatural movements involved in a powerful swing. Exercise which involves all the limbs and joints is probably best, like swimming, dancing, and playing tennis. As with a lot in life I believe that moderation is the key... We are anatomically and physically much the same as early man, the hunter gatherer, who would walk for miles in a day or run for short bursts and then take a break..