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Why does one person develop strength and muscle faster than another when he or she is performing the same exercises in the same training program? There are six primary factors affecting every person's ability to achieve strength and muscle development, and we have little or no control over most of them.

Type of Muscle Fiber

One of the most influential factors is muscle fiber type. There are two basic types of muscle fibers: "slow twitch" and "fast twitch." Slow twitch muscle fibers are best used for cardiovascular (aerobic) activities. They produce small levels of force for long periods of time and thus are better suited for endurance activities. Fast twitch fibers are best used for anaerobic activities. They produce high levels of force for short periods of time and are best suited for power activities such as weightlifting.

Most men and women have an equal combination of both slow twitch and fast twitch fibers. However, some people inherit a high percentage of slow twitch fibers that enhance their performance in endurance activities, such as long distance runners. Most world class marathon runners have a very high amount of slow twitch fibers. Conversely, world class sprinters have relatively more fast twitch muscle fibers. Although both fiber types respond positively to strength training exercises, the fast twitch types experience greater increases in muscle size and strength, and thus may obtain greater and/or faster results from a strength training program.

Age

Another factor over which we have little control is age. Studies show that people of all ages can increase their muscle size and strength as a result of a safe and effective strength training program. However, the rate of strength and muscle gain appears to be greater from age 10-20, the years of rapid growth and development. After reaching normal physical maturity, muscular improvements usually do not come as quickly.

Gender

Gender does not affect the quality of our muscle, but does influence the quantity. Although men's and women's muscle tissue are characteristically the same, men generally have more muscle tissue than women do because muscle size is increased by the presence of testosterone, the male sex hormone. The larger the muscles, the stronger the person; this is why most men are stronger than most women.

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