Hippocrates once said that exercise is man’s best medicine and he was not wrong. If you need another excuse to hit up the gym, know that a lifetime of regular exercise significantly reduces the effects of aging on the immune system, muscle mass, and cholesterol.
A paper published in the journal Aging Cell measured highly active people aged between 55 and 79 on a range of fitness criteria. While it was previously assumed that aging causes the body to become frail regardless of how many gym hours you put in, the results suggest this is not the case. In fact, the active seniors were able to maintain the body fat, cholesterol levels, and immune system of a young person. In men, regular exercise was also found to keep testosterone levels high and possibly help sidestep the male menopause.