The main components of the skeletal muscle are myocytes, capillaries and interstitial tissue. Aging affects these components differently with loss of muscle fibers (sarcopenia) as the most important change since it is the primary responsible for muscle function decrease with aging. Among non-pharmacological factors that may have a beneficial influence on the effects of aging on the muscle, exercises are the most appropriate. Both resistance and aerobic exercises have proven to curtail the effects of muscle aging. The aim of this paper is to present a review of the main morphological changes that aging brings about in muscles and show the importance of exercising to minimize these changes.