Kuji-in was mentioned by the guy with the Bleach picture (sorry, don't recall your name). Kuji-in was mainly used in ninjitsu. Some call it ninja socerey. It is sort of like chi manipulation. Here is some info!
As it seems, the kuji-in technique is composed of a ritual technique containing the traditional application of the Buddhist three secrets (mudra, mantra, mandala). The true kuji-in secret lies within the contemplation of its philosophy that we use to change our attitude in life. The goal of the kuji-in technique is not to acquire strength, control, healing powers, telepathy… these are only side-effects of practicing the ritual technique and focusing a bit on the philosophy. Most people learn the technique simply to get these side-effects. They will develop only to a tenth of what they could if the kuji-in was practiced to its fullest. The real kuji-in path is the quest for knowing the truth about ourselves. It is a contemplation of higher principles, an application of noble behavior in our daily lives, and mental availability to perceive knowledge that is not studied, but revealed. Once a revelation occurs, one of the side-effects will develop rapidly without effort.
Looking back qi gons the best thing you can get into. Its like reading a doctors notes on energy. But more importantly it gives you the fuel you kneed to practice the techniques you want to learn.
Say for example your trying out techniques that require you to gather energy before starting, if your not monitering the amount to takin to your dan-tian or into your body, by use of whatever energy tech your using then your eventually going to utalize your own life energy and fatique yourself or get sick. (anime refference: lets say like Kuwabara but if you gather energy even when you dont need it you shouldnt need to as much for your own techs and energy, like Genkai) Its like having money on you before you go to a store, so you dont need to pull out cash when you really need it)
Ive heard having too much energy can be harmful, but i dont think that goes for dan-tian, since its compact and stored and should only be used when you will it. Maybe theyre talking about your energy-body or physical.
Close your eyes sit or lye in a comfortable position. Play a simple calming soothing tune in your head and open yourself up(just stay calm and alert). Now see a blue mist surrounding the area and coming into your glass like body and fill you up feel that and feel it surround you. Don't force it let it flow and feel it. That is the first step to manipulating: feeling.
