You guys play once a week, we play "almost" everyday. The pitchers run poles to endure longer outings. Nolan Ryan did them everyday. He played 20 years and was still throwing 95 at 40. Position players run bases for conditioning in Spring Training. During the season, we don't do much conditioning as an everyday player. Why? Because we play almost EVERYDAY. Just for myself, I caught 200+ pitches every time I caught. That means I did at least 200 squats every game. (not counting warm ups before game and at start of inning.) If I caught 120 games in a season, that's 24,000 squats I did over the course of the regular season. Plus all of ST, and then the warmups before and during the game. We play 162 games. Plus Spring training, and then the playoffs if we get there. If you make the WS, you are talking 190+ games. NFL games are brutally violent, and I'm not understating that, but our game is more about endurance and longevity over a 7 month season of daily attrition. It is a marathon, not a sprint.