Motocross is hands down the most physically demanding sport. 30 min. motos, 100 degree heat, punishing terrain, mud, rutted corners, whooped out straights, jump faces with holes in them, up to 125 foot leaps. If any one who is voting for football is willing to try this on a 450cc dirt bike, I will gladly loan you mine. a riders heart rate is constantly hovering around 180 bpm, you are dressed from head to toe in protective gear that adds 15 pounds or more to your body, while trying to manuever a 200 pound machine through rough terrain, and over obstacles that most people would walk around rather than over, all while trying to go as fast as possible. you tell me which is tougher !!!