There are different Qi exercises, some basic ones which are beneficial to the health and Qi in general and some special ones for enhancing acupuncture therapy in particular.
Generally speaking, the standing meditation (Zhan Zhuang) is the best one and the easiest to do.
You don't have to worry about the deviations during the Zhan Zhuang practice. You just try to relax and listen to your breath. That's enough.
Of course one needs to learn it from a teacher. |