There's a significant distinction between racing at the limits of your physiology and the limits of your commitment to the sport and your training going into th

There's a significant distinction between racing at the limits of your physiology and the limits of your commitment to the sport and your training going into the race. I think the latter may be more interesting and useful: not many can afford the time commitment to eating, sleeping, and training to the max. But when a high-school kid takes 30 seconds off his 1600m PR in the meet with the rival school? That's just because he didn't know he had more available.