yes you never heard of wushu cause everybody knows it by the name of kung-fu but kung-fu means skills! and you can have skills in fishing and esf but wushu means "warart" (in dutch oorlogskunst) but i could be wrong cause i can not transelate that well in english. so wushu is warart and it is the right name for kung-fu and it rocks also but that is another statement :]
srry for edit but I just looked up rigid in the dictionnary and tai chi and hun gar may be rigid but wushu is everything else but rigid realy just ask jacky chan :] he is an expert in wushu (kunf-fu)