Exercise ? increase testosterone?

There is a good deal of research exploring the link between exercise and testosterone. For example, one study found that regular physical exercise in females (ten or more hours a week) helped to increase testosterone levels while lowering body mass index. And, it's probably no surprise to learn that it's possible to do just the opposite with too much exercise. Several studies show lower testosterone levels in some endurance athletes. If you are such an athlete, or are experiencing symptoms of low testosterone ? low sexual function or desire, sleep disturbances, reduced muscle bulk, depressed mood ? you may want to consult your health care provider.