What is to be done, if the legs shake or the knees hurt while practising in a standing position?
Those phenomena mostly happen only to beginners. In case the shaking does not cause pain one can try to go on practising unchanged. If the shaking is too exhausting, beginners can stand less low. However it is important that the knees are never locked. If one is already well trained it is favourable to stand even lower in order to avoid the shaking. In case of pain in the knees one may find a painless posture by adjusting the standing height.
Shaking of the legs and pain in the knees indicates that the energy (Qi) already moves within the body; however the Meridians are not jet sufficiently free.