After reaching normal physical maturity, muscular improvements usually don't 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. Another strength factor that is naturally determined is limb length. Similarly, differences in strength development may come about because of variation in muscle length.
Some people have long muscles, and some people have short muscles.
Persons with relatively long muscles have greater potential for developing size and strength than persons with relatively short muscles. Point of Tendon Insertion Muscle strength is also influenced by the point of tendon insertion. For example, let's say Jim and John both have the same arm and muscle length. However, Jim's biceps tendon attaches to his forearm farther from his elbow joint than John's does. All of these factors affect our ability to gain strength and muscle development through training.