Quote Originally Posted by shinta|hikari View Post
Really? I thought this was true in RL. Gymnasts and sprinters have slimmer and sleeker bodies after all.7

Sprinters, compared to long-distance runners, generally have a more developed upper body due to the need for upper body balance. Their long distance counterparts have less bulk due to the requirement for endurance over maximum output.

I've seen a snippet of this Muay Thai drama where they reveal that doing excessive bicep curls would limit the explosiveness of your punches, but that may only be slightly more credible than anime.