Why is a cold hard chest is only a little bit of a hard-

I am a student, I like to do push-ups, chin-up, etc., but

that one day face, see my chest a stiff and unyielding, a ...

this why the

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first to observe their movements, the arms made power is balanced, two-handed push-ups when the interval is appropriate, the body is centered.

Every time before exercise whether there are sufficient preheating, if necessary, post-exercise stretching movements to promote muscle recovery.

Occurs deviation, should pay attention to strengthening the weak side of the training, to strengthen. While also carefully observed, sports, the side of the original dynamic muscle strength and fighting unsolicited muscles relax

I wish health, fitness

because the piece never reaches ah

doing movements are not standardized, the next time you Note that action would also like to put their ideas out of focus that is not hard top.

In addition, there such a phenomenon is normal, people left and right can not be exactly the same, I have the right than the left arm is a rough 1cm