An individual who lifts 200 lbs. Slow-twitch fibers are relatively fatigue resistant and well suited for prolonged aerobic activity. A preponderance of one type of fiber will predispose you for success in activities which involve that type of fiber. No two muscles in your body have exactly the same function. The functional unit of neuromuscular control is called a motor unit.
Motor units vary widely in size.
During exercise that requires an oxygen uptake of 4.0 liters per minute, the muscle's oxygen consumption increases nearly 70 times over its resting requirements. Strength training should not be a contest - against anyone else or yourself. If you focus on the competitive aspects of how much you lift, you increase your risk of either being injured or getting discouraged with the results of your efforts. Proper strength training can induce improvements in both muscular strength and balance, thereby helping prevent dangerous falls. Maximum strength of men and women is generally achieved between the ages of 20 and 30 years.