"A sprinter in a race almost immediately enters a state called 'oxygen debt.' His body switches to an emergency source of energy that's faster than regular aero

"A sprinter in a race almost immediately enters a state called 'oxygen debt.' His body switches to an emergency source of energy that's faster than regular aerobic respiration. But this process builds up waste products that ultimately require extra oxygen to break down, so at the end of the race he has to stop and pant for a while to recover." As a point of information, it's unusual to think of anaerobic respiration as an emergency source of energy; you tend to think of emergency situations as necessarily involving adrenaline, which increases heart rate, dilates blood vessels, etc. The biggest energy source of the 100m and 200m sprints is phosphocreatine, a very useful fuel for anaerobic metabolism; unfortunately for sprinters, it can be depleted in under ten seconds of top physical effort. (Incidentally, A.V. Hill received the 1922 Nobel Prize in Physiology for figuring out the proportions of aerobic and anaerobic metabolism that contribute to energy production in the various distances of Olympic footraces.) This, of course, is all to say that sometimes lies aren't really malicious - as he says - but that it's simply easier to say simple things than complex things. Since it was tangential to the discussion anyway, it's no big deal. And if you disagree (as many experts do, even amongst each other) about the role of phosphocreatine, I'll be perfectly content with you calling me a liar :)