It's probably not that complicated. It probably goes something like, our species developed using our brains and exercising in harmony, so they wound up linked to eachother, simply because everyone was exercising. The two systems developed together, and simply because there was no reason NOT to be, wound up intertwined.
Like what I've heard about automatic transmissions. Supposedly, some automatic transmissions do not lubricate themselves when coasting in neutral (the pump is driven engine-side), and for this reason you shouldn't regularly coast long distances at freeway speeds in neutral on an affected automatic. Why is it this way? Simply because it's easy to slave the pump off the engine-side, and at 65mph, you generally have your engine engaged! So why NOT?
Evolution is all about selective pressures, but equally important are the absence of those pressures.
Like what I've heard about automatic transmissions. Supposedly, some automatic transmissions do not lubricate themselves when coasting in neutral (the pump is driven engine-side), and for this reason you shouldn't regularly coast long distances at freeway speeds in neutral on an affected automatic. Why is it this way? Simply because it's easy to slave the pump off the engine-side, and at 65mph, you generally have your engine engaged! So why NOT?
Evolution is all about selective pressures, but equally important are the absence of those pressures.