There's nothing insane about soccer's 5mph average speed over 90 minutes. Nothing insane about basketball's 400 calorie per hour burn. And your favorite sport, the actual fatball, doesn't tax endurance at all. And pitching is actually more demanding than ANYTHING you see in soccer, basketball, and football. Hitting is more demanding, because of the coordination it requires the athlete to have throughout his entire body. It's so difficult, that the adrenaline buildup you can use as an advantage in other sports, will you up at the plate, since the fine motor skill pressure you are under is A LOT more demanding than dribbling a ball, kicking a ball, shooting a ball, or carrying a ball.
Your argument also disqualifies volleyball players, decathletes, short track sprinters, shotputters, javelin throwers, discus throwers, divers as real athletes. Do you realize how stupid you sound now?