why do boxers make a wheezing sound when they punch?

[letsgobrady]

fighters like roy jones jr and mayweather jr are easily noticed doing that. can some1 explain to me the science behind it

most trainers tell you to exhale every time you punch

[FIGHTING_FLIP]

i hate when fighters scream when they punch. especially when i see it in the gym. f uckin annoying..my quote is "a lion while hunting doesnt roar." i mean of course ill make the breathe sound. but the whole yelling bullsiht is doin to much

[mannyman]

They're breathing out but tbh in any form of exercise you breath out on the effort i.e a punch