There's something that always bugged me with the scene where a character kick or hit the rock so hard it literally become a missile.
Won't the rock get destroyed the moment of contact with the kick? . Or is it conveniently warped with magic shield so it won't shatter and only destroyed on the impact
That just never have any explanation in any manga lmao
A rock would most certainly be destroyed by a sudden force that sent it off with so much power, yes.
But if you need an explanation that physics can give to offer you some comfort, as long as it's not a 'kick' but a 'throw with a leg', as in, the leg is actually stopped/slowed before hitting the rock and then speeding up explosively, then yes. A rock can very much withstand that easily and accumulate enough power to smash through a bunch of large-sized monsters, so long as they're flesh and blood anyway.
But if you go explaining stuff in the first place, this crater left in its wake is physically not possible either (especially since this shape suggests that it either accelerated as it went or was shattered and the pieces fanned out). Hence it is best to assume that these feats are in fact a combination of physical strength and supernatural element which would make the rock withstanding the impact quite a lot more reasonable.