What a way to end your career...
This guy is/was a champ.
-http://running.competitor.com/2014/02/junk-miles/6-animals-faster-than-usain-bolt_95078
-http://www.bbc.com/sport/athletics/39166753
-http://www.telegraph.co.uk/athletics/2017/08/12/usain-bolts-last-race-london-2017-4x100m-relay-live-updates/
Achilles' Heel
https://en.wikipedia.org/wiki/Achilles%27_heel
