Most seasoned practitioners of zhan zhuang should be able to feel being "muscles-as-one". But, as far as I know, most don't feel hairs-standing-up during their zhan zhuang exercise. Why? And what is the significance of this goosebumps thing?
Anyone who have some familiarization with human physiology understand that goosebumps are caused by exposure to a cold environment or being extremely emotional. Discounting the latter cause, the only cause of goosebumps during zhan zhuang is through exposure to a cold environment.
A second question arises: why did the master ask his students to experience goosebumps? Before we answer this question, one must answer another question: Why most contemporary Yiquan masters don't mention this point (and some have all sorts of fanciful and mythical explanations [like hair-sensitivity training of a cat's whiskers type!]). In order not to arouse too much unnecessary debates here, I shall leave a reader to form his own opinion after reading this post!
Now back to the second question. When exposed to cold environment, our natural response is to have goosebumps (to try to stop heat from leaving our body) and to shiver. Shivering is counter chi-generation. Therefore a practitioner is asked to do zhan zhuang in cold environment, let him have goosebumps, BUT he will be required to focus and relax and to avoid the natural response of shivering.
It is the same theory behind doing cold (shower/waterfall) meditation. Interested readers can refer to my previous posts on the subject, you might like to start with this one).
|Hairs-standing-up (goosebumps 毛发如戟)|