It destroys harmful bacteria and stimulates a cascade of positive hormone effects in the body. While excessive sun exposure can be harmful, so can inadequate exposure. Outdoor exercise will give the necessary sunlight without excess. Make it a point to get a modest amount of sunlight per day, whether by outdoor exercise or ten minutes of sunbathing. The human body is designed for movement.
Aerobic activity encourages normal circulation of blood and lymph.
Heart and structural muscles are strengthened by exercise. Hormone production and utilization is improved by regular exercise. The bowels depend on physical movement to function normally. Metabolism and immune system activity are increased by moderate exercise. Bones require weight-bearing exercise for normal mineral uptake.