Start by taking your shirts off

And the guy with the cat-mouth is the sidekick

Because it's an inspiring story of a wimp who becomes the most powerful man on the planet?

Can't at least one anime find grounding in proper physics? Jesus.

Well KenIchi had some pretty good realism. He had to train for a week to beat a school bully, then he had to get knocked out several times, die, get revived by a physician and train more to defeat a mafia that was after him.