You know that there is not much material about it, powercenter you can visualize it as the points of support that naturally has the body. the same ones that generate the sensation of being powerful in the case of a super hero pull out his chest forward, or someone who is very tired and has a hunched back, I think it is more to study the cartoons, comics and old sleeves to understand the powercenter. greetings .. I will look for an animated book to pass you the link pdf and take advantage of the technique.
Greetings
Thank you !