1, the arm muscles mainly control the grip strength of the hand, and the grip strength and wrist flexion and extension will be practiced to the forearm. The forearm muscles with bare hands can be exercised by hanging towels and grabbing towels.

2. Muscle is mainly composed of muscle tissue. Muscle tissue consists of muscle cells (muscle fibers) and connective tissue. Muscle cells are slender and fibrous, so muscle cells are usually called muscle fibers. The cells are rich in myofilament protein, which is composed of thin filament and coarse myofilament. Head muscles can be divided into facial muscles (expression muscles) and masticatory muscles. Trunk muscles can be divided into dorsal muscle, pectoral muscle, abdominal muscle and diaphragm. Lower limb muscles are divided into hip muscles, thigh muscles, calf muscles and foot muscles according to their positions, all of which are stronger than upper limb muscles, and are related to supporting weight, keeping upright and walking.

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