Serious eye strain can lead to persistent headaches, muscle pain in the head, neck and upper back, as well as long term problems like myopia.
严重的眼疲劳会导致长期的头痛，头部，颈部和上发背的肌肉疼痛，也可能会引起一个长期的问题近视。
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。
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 and the back.
功能：增强上肢及背部肌群力量。
Function: Enhance the muscle strength of upper limbs and the back.
功能：增强上肢及背部肌群力量。
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