Usain Bolt said this quote
“ Thankfully, Coach had taught me a way of embracing the pain. He called that overwhelming rust of hurt 'The Moment of No Return', a point of pure agony when the body told an athlete to quit, to rest, because the pain was so damn tough. It was a tipping point. He reckoned that if an athlete dropped in The Moment, then all the pain that went before it was pointless, the muscles wouldn't increase their current strength. But if he could work through the pinch and run another two reps, maybe 3, them the body would physically improve in that time, and that was when an athlete grew stronger. ”