Sure, whatever. The original point about your brain moving faster to keep up with your feet is stupid in any context. There's countless techniques in nearly every athletic sport about how to shut your brain down so that only your muscles and autonomic nervous system are doing the work. Athletic speed has no effect on other forms of intelligence. If anything it has a negative effect because sprinting is anaerobic and therefore is cutting off oxygen to your brain. I have no idea what you're getting at with the life jackets.
It's tough to use intuition to bring any real insight to bear on biological systems, I'd be really interested in finding some real research into the matter.
Re: the lifejackets I was demonstrating that the effectiveness of the jackets is not effected by who chooses to use them. I was pointing out that saying less intelligent people gravitate towards sprinting does not prove that sprinting has no positive benefits on intelligence.
