lot of it is building goofy looking helmets that plug into cardboard boxes with tin foil wrapped around them and pieces of paper with like visual illusion things taped to it.
lol... um... pass on this one

I prefer to read Cousin Trevor. He goes off on these arcane tangents about things you can do with a boxing glove, sand-paper, and enough open land, but once you get past that, you can learn a lot about becoming a qi warrior and countering secret attacks by government qi soldiers.