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。
The tricepes muscle in the back of the upper arm is an extensor. When it contracts, the elbow strainghtens and the forearm and hand move away from the shoulder.
而后上臂的肱三头肌则是一块伸肌，当它运动时，肘部就伸直，而前臂和手就离开了肩部。
The tricepes muscle in the back of the upper arm is an extensor. When it contracts, the elbow strainghtens and the forearm and hand move away from the shoulder.
而后上臂的肱三头肌则是一块伸肌，当它运动时，肘部就伸直，而前臂和手就离开了肩部。
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