Okay, this will be long so excuse me, I won't paste the links (takes too much time and it's nearly 2:00 am)
These are strictly shonen manga.
Black Clover
Bleach (stop at the end of the Arrancar arc)
Dragon Ball
Fullmetal Alchemist
Gintama
GTO
Hunter X Hunter (stop when you arrive at the top of the tree -the manga's on hiatus)
Kimetsu no Yaiba
Mob Psycho 100
Naruto (stop at the end of Pain arc)
Nurarihyon no Mago
One Piece
Rurouni Kenshin
YuYu Hakusho
I 100% agree with mythical_dragon and Bia-chan <3's choices btw ;)
Don't read Naruto. I've taught five-year-olds with more creativity.
"All You Need Is Kill" is the shit. And "Beserk" isn't shounen, but dem guys be ripped. They're pretty OP, but I feel that the overall creativity and presentation of the story more than make up for it. It's still ongoing, though. Has been for over twenty years. "Tokyon
"Angel Densetsu" is great and the guy is strong, but it's a comedy with no intentional fighting. The guy is a total pacifist, but sometimes ends up accidentally beating the crap out of people.

Can any one recommend me Shounen manga? Or a main character that is physically strong?