1 chest: it is mainly pectoralis major, including upper, middle and lower parts, which are distributed under the chest skin in front of the human trunk.

Back: including trapezius muscle, rhomboid muscle and latissimus dorsi muscle, which are distributed on the back of trunk;

Shoulder: it is mainly deltoid muscle, including front, middle and back three bundles, and it is an inverted triangle muscle distributed in front, outside and back of shoulder joint.

Four arms: mainly including biceps brachii and triceps brachii, distributed in front and back of the upper arm.

Waist and abdomen: mainly including abdominal muscles, erector spinae. It is distributed under the thorax between pelvis and both sides of the midline of the back, and filled in the groove between spinous process and pudendum process. Leg 6: It mainly includes quadriceps brachii and biceps femoris, which are distributed in the front and back of thigh. Gastrocnemius muscle and soleus muscle are distributed in the posterior and lateral sides of the calf.