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That comes from the behind-the-scenes peek from the famous Time interview with Tiger Woods: http://scoregolf.com/blog/lorne-rubenstein/the-goods-on-woods/ . Tiger, it turns out, is wrong. The golf swing is too fast. Even if you could instantly form a thought and direct your muscles to do something, it quite literally takes too long for the nerve impulse to travel from your brain to your muscles for it to do anything past about A5. That's right: if your brain hasn't told your muscles to do something by A5 (or when your lead arm is parallel to the ground on the downswing), it ain't even gonna begin happening prior to impact. Several biomechanists and neurologists agree.