Posit: One cannot learn proper and effective body mechanics from a book or video. My argument is simple and based on experience and observation. You can open a book on martial arts or pop in a DVD and see how a block is to be applied or a punch or kick is to be delivered. You can emulate what you see, and practice it extensively. But it won't be effective, except accidentally. Why? Because there is a world of difference between a block (for example) and a properly-set block. The difference between a good block and a bad block can be a matter of inches or even fractions of an inch. It can vary between individuals, based on body type, height, weight, and so on. To be effective, a good block must be demonstrated and adjusted by someone who knows how to do it, and it must be tested and felt and understood on a physical level by the person learning it. Comments?