what happens when fighters dont breathe out

[YoungJab]

while throwing punches?

is this bad

[$partacus]

It's best time to do it, breathe out throwing punches, breathe in when you stop. It's hard to breathe in while throwing.

[Megalodon]

I think it affects your blood pressure as well.

[grownfolk.us]

while throwing punches?

is this bad

Yes, if you get caught in the stomach while punching it will hurt a lot more and probably knock the wind out of you.