Martial art with movements like "Parting the Horse's Mane" and "Grasp Bird's Tail" (3,3)

(Other definitions for tai chi that I've seen before include "Chinese martial art and system of callisthenics" , "Chinese system of slow exercise for relaxation, balance and health" , "system of exercises" , "Way to cross a fence" , "'Chinese form of slow physical exercise (3,3)'" .)