1. The strength of different muscle fibers varies greatly in the same muscle group. Specifically, strength mainly depends on the strength of stronger muscle fibers, and all muscle fibers have an effect on muscle circumference. In other words, people with great strength only have strong muscle fibers that are superior to ordinary people, while people with big muscles will take into account both strong muscle fibers and weak muscle fibers in order to make all muscles uniform.

2. Strength mainly depends on the number of transverse bridges in muscle fibers, while girth depends on the hypertrophy of muscle fibers. Although the number of transverse bridges will thicken muscle fibers to a certain extent, the same number of transverse bridges can also make muscle fibers double hypertrophy, which is also the skill of professional bodybuilders.

3. Strength also depends on the speed of exertion. The faster the muscles exert their strength, the greater the strength they show. As we all know, in the training to increase the circumference, we will deliberately use a very slow speed.

The most important point is that strength depends largely on the ability of major muscle groups to coordinate their efforts, which is much more difficult than it sounds, and this ability varies from person to person.

When we exercise, although we use muscles, it is the nervous system that gives orders. If we compare muscles to soldiers and nerves to generals, then we will understand that although the more soldiers, the higher the winning rate; However, without coordination, they may all be defeated by a small but well-coordinated team.

Similarly, in our fitness training, if we only pay attention to the individual strengthening of a single joint and a single muscle group (such as biceps bending), then your nervous system will get used to this single mode of lack of cooperation between muscle groups.

When we start to engage in more complicated movements, such as pull-ups, handstands, basketball and football, our brains can't make the best decision, and your strength order, required muscle groups and related nerve reactions will be not smooth, so naturally we can't compare with people who have been carrying out comprehensive physical training (such as crossfit).