This is the section probably a lot of people are really interested in, since these are actual techniques while the previous section was more thought-training, Active Techniques typically give much better short-term performance. However the draw-back is that most of them wear out over a protracted period of time, as the energy you produced runs out. Additionally since they are techniques, they are harder to use, and require more practice to use effectively.
When some people see the concept of generating energy which will be presented in this section they think they can now become a limitless energy source. This is wrong for so many reasons. First and foremost, Conservation of Energy says energy can neither be created nor destroyed. Before anyone tries to counter my physics with quantum physics remember that most quantum physics principles only work on a very small scale, around 10^-15 or so (credit to Cullen for this).
What this means is even if you generate more energy, the power to do that has to be coming from somewhere. That somewhere is assumed to be the food you eat. So even if you could keep up the technique for a very long period of time, you’re going to run out of the resources to create energy eventually. Stuffing your face also will not work because it takes time for the body to process the food you eat.
Also its unsure for a lot of Energy Management techniques whether one is actually generating energy or rather restructuring their available energy to bring what reserves they already had forward to be used. If this is the case, you definitely do not have a limitless energy source. Additionally many Energy Management techniques inherently have a limited number of uses as the energetic state they bring on makes it harder to focus. Eventually you will be too excited to properly perform the technique. In both the first and third case attempting to continue using Energy Management in spite of the finite limit can result in injury. So don’t be stupid. That is all.