Since ancient times, coaches and athletes have been linked by bonds of obedience, responsibility, and butt busting. This has all fallen a bit by the wayside in recent years, except in China and Korea where rumor has it the cane is freely employed in training.
Corporal punishment provides immediate feedback, it's in keeping with the physicality of the athletic male, it increases excitement and aggression while teaching endurance and indifference to pain.
It's a real tragedy the paddle isn't used at the professional level in American Football. Those football pants are designed to drive spankos crazy!