It kind of seems to be you who is talking about one specific sport and dismissing everything else:
Long jump is 24ft (for a level 20 barbarian with top stats) in D&D vs 29ft real world for someone who could not possibly fight an elephant-sized flying fire-breathing lizard and live to tell the tale.
Top sprinting speed real world is 180ft/round, which IIRC requires a high level monk/rogue/barbarian combo to reach.
Marathon running is 120ft/round, which is at least doable by a rogue with mobility. But if you use the chase rules, he's not going to be able to actually do that all race.
Forced march rules are pretty crazy too:
http://www.bushwalkingvictoria.org....ng-challenges-australian-alpine-walking-track. Day 4 and 7 have a pretty high chance to kill you through exhaustion according to D&D rules, and this isn't world-champion level stuff.
Lockpicking medieval level locks is apparently really easy to fail at, despite most experts regarding such a thing as trivial.
D&D characters flat-out die after a maximum of 14 days with no food. As far as I can tell, real world people go for 30+.
D&D characters flat-out die after 6 days with no water. People have survived to 10.
I think the encumbrance rules are probably ridiculously generous.