Muscles spanning the upper back, the middle trapezius and rhomboids, pull the shoulder blades towards the spine to open the front of the chest.
中斜方肌和菱形肌(贯穿上背部的肌肉)将肩胛骨向脊柱的方向拉，从而打开胸廓。
Functions: Enhance the muscle strength of upper limbs, chest and the back.
功能：增强上肢、胸、背部肌群的力量，提高人体心肺功能。
Function: Exercise the upper arms, chest, back and the abdomen muscle strength.
能：锻炼上臂、胸、背、腹部肌肉力量。
Function: Enhance the muscle strength of upper limbs, chest and the back., improve the cardiopulmonary function.
功能：增强上肢及背部肌肉力量，提高人的心肺功能。
Function: Enhance the muscle strength of upper limbs, chest and the back., improve the cardiopulmonary function.
功能：增强上肢及背部肌肉力量，提高人的心肺功能。
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