Trapezius: trapezius deltoid: deltoid biceps: biceps brachii: triceps brachii: brachialis radialis pectoralis latissimus dorsi: latissimus dorsi rhomboid: rhomboid sawtooth: serratus serratus: rectus abdominis: oblique. ...

There are about 639 human muscles. It consists of about 6 billion muscle fibers, the longest is 60 cm, the shortest is only about 1 mm, the big muscle weighs about two kilograms, and the small muscle weighs only a few grams. The average person's muscles account for about 35% to 45% of the body weight.

According to the different structure and function, it can be divided into smooth muscle, myocardial muscle and skeletal muscle, and according to the shape, it can be divided into long muscle, short muscle, flat muscle and orbicularis oris muscle. Smooth muscle is mainly composed of viscera and blood vessels, which has the characteristics of slow contraction, lasting contraction and not easy to fatigue. Myocardium constitutes the heart wall, and neither of them contracts with human will, so it is called involuntary muscle.

Skeletal muscles are distributed in the head, neck, trunk and limbs, and are usually attached to bones. Skeletal muscle contracts rapidly, forcefully and easily, and can contract and contract with people's will, so it is called voluntary muscle. Skeletal muscle is striated under the microscope, so it is also called striated muscle.

Skeletal muscle is the dynamic part of the exercise system, which is divided into white muscle and red muscle fiber. White muscles contract or stretch rapidly through rapid chemical reactions, while red muscles exercise through continuous oxygen supply. Under the control of the nervous system, skeletal muscles contract and pull bones to produce movement.