You realize that where the MC is from the gravitational force is equivalent to that of Jupiter’s. Their entire body has adjusted to living under such conditions. Which means that the hardest punch you can throw, is no where near the level of a new born toddler.
Even a toddler born where the MC is from can break a 10in steel plate with ease.
This world really sounds like fun I don’t know why I think this way but my mother knows a guy who was a boxer and the second she told me that my first thought was I really want to punch him I also challenged friends and family of mine who know martial arts to fightS granted it was sparring matches