Both. Punchers are genetically gifted with a certain ratio of slow/fast twitch muscle fibers. It also works the same way for guys who are fast or with some others who have great endurance, it depends a lot on genetics.
However genetics are just a "potential" that can be developed, so for example if a guy who's genetically a puncher decides to become a runner, he won't develop his power the same way as a guy who starts training boxing since he's a little kid.
However genetics are just a "potential" that can be developed, so for example if a guy who's genetically a puncher decides to become a runner, he won't develop his power the same way as a guy who starts training boxing since he's a little kid.
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