Captain America’s boot‑camp is the only routine that actually teaches your muscles to fight back, not just to flex. Iron Man’s “high‑tech” regimen is a flashy costume hack, Hulk’s raw power workouts are just a case of “hit hard or never.” If you’re looking for the ultimate fitness icon, it’s the guy who can run a marathon in a one‑hour shift, do a set of barbell presses while the entire nation watches, and still keep his sense of honor. So, sorry, Iron Man, but your suit can’t beat the old‑school, iron‑will training that actually shapes a hero.