Merrick Morton / Columbia Pictures
Weight: Unknown. But the actor had to bulk up significantly to play Spider-Man after having slimmed down to just 137 pounds to play jockey Red Pollard in "Seabiscuit."
Heroic secret: To go from high school nerd to muscle-bound hero, Maguire underwent six months of six-day-a-week training, which included martial arts, weight lifting, gymnastics and, yes, massage. Spider-Man is one of the more sensitive superheroes.