Lacking push-off from the toes, some people substitute the knees for this function.
很多人用膝蓋來代替腳部的PUSH-OFF動作(或是ANKLE的動作)，怪不得很多人年紀大時，會受退化性膝關節炎之苦。
很多打太極者為膝蓋痛所苦，不可不深思此問題。(另一問題為膝蓋對腳尖)
The forefoot--from the balls of the foot through the toes--is where your foot finds power. The toes' push-off from the ground completes the action of hip, knee, and ankle to propel your body forwrad.
這一句話點出了，太極拳中所謂的三折疊，力由腳發出的。
