How does 17 managed to hold his own in a beam struggle against Toppo, even though he was physically overpowered?

[Natasha Romanoff]

What do you think?

 

[Papasmurf]

He learned how to use invisible Kaio-ken

 

[GSM123]

Typical Toei nonsense. Gohan's own blast was tanked and one of the writers said Gohan = 17. Maybe infinite stamina allows for better charging somehow.

 

[Warmmedown]

He wanted to make it look like he struggled, to make it more believable for Toppo. Act of charity for the disabled or enslaved (he assumed Toppo was disabled or a slave because nobody else would end up with that moustache). Like when Superman arrives just in time to save someone, because arriving early got boring. The mental curse of having unlimited energy.