Assessing the limits of human performance

Ross Tucker and Jonathan Duger have written a very thorough article, entitled "Swifter, higher, stronger...up to a point? Or beyond? The limit of human performance." 

A tidbit in case you aren't sure if you should click:

"I don't believe there are fundamental physiological principles that have not yet been discovered.  Performance is limited by the physiological regulators, and things like VO2max, running economy, threshhold running pace and thermoregulation are known to be regulators.  So we're either wrong, or we're still waiting for that one-of-a-kind human being who possesses physiological stats never seen before.  That wasn't the case in the 1950s - they were good athletes with exceptional but expected physiology, and it was lack of professionalism and training/diet, along with "vision" of what might be possible that limited them."