"The exercising of weapons putteth away aches, griefs, and diseases, it increaseth strength and sharpeneth the wits, it giveth a perfect judgment, it expelleth melancholy, choleric, and evil conceits, it keepeth a man in breath, in perfect healthe, and long life." – George Silver (1599)


Me and Miles both think 52 blocks is fascinating. This talk about it and other things by Sifu Rudy is good good stuff.
Here is a Lulu book on Internal Kung Fu by him.