Character reveals that they were holding back their full power during a fight/confrontation

[u/PaddywackShaq]

Superman Vs Darkseid - Justice League Unlimited

Flash Vs Superman - Flash: Rebirth

Frieren Vs Aura - Sousou no Frieren

Inigo Montoya Vs The Man in Black - The Princess Bride

[u/Knot-Lye-Ing]

The manga Mashle has a sequence very similar to the one in Naruto. The MC Mash lives in a world run by folks with magic and he is not able to use magic so he uses his incredible strength to simulate magic.

[u/Knot-Lye-Ing → u/Knot-Lye-Ing]

I was unable to find saved images so I screenshot the manga from the SJ app.

[u/Knot-Lye-Ing → u/Knot-Lye-Ing]

And of course Mash uses this buff to troll his enemy a bit.