Almost caught a car door

[MelodicMetalGod]

Hey Seuadr, I tell my beginning students both the real and the "fake" reasons for the yelling. Then, when we graduate to sparring, which is heavy duty full contact for us, I show them my particular reason for doing it. As big and relatively slow as I am, a disarming amount of noise is distraction enough to blow most peoples game plan.
As to the real aspect, it's the same reason you hear boxers hiss- you are actually tightening up your bodys core so you can both deliver more power (physiologically proven) and be ready for a counterattacks impact.
But-it does sound silly to begin with.

Funny, but I used to think that the boxer's "hiss" was the air getting forced out of their gloves as they landed a punch. I assumed that there was some sort of air cushion in the gloves. The things kids think up.....

The yelling bit is pretty effective. I've used it to stay OUT of physical fights. However, the most use that I've made of it is playing softball. At the plate, as I put the bat on the ball, I used to take a fair amount of ribbing for releasing a bit of a "grunt/yell". It helped me deliver more force to the ball, just as Paulyboy says. Sounds a bit funny, but it is a useful thing. Plus, if you deliver a great shot everybody thinks you're a monster for the rest of the game.

[TheCafeKid]

Funny, but I used to think that the boxer's "hiss" was the air getting forced out of their gloves as they landed a punch. I assumed that there was some sort of air cushion in the gloves. The things kids think up.....

The yelling bit is pretty effective. I've used it to stay OUT of physical fights. However, the most use that I've made of it is playing softball. At the plate, as I put the bat on the ball, I used to take a fair amount of ribbing for releasing a bit of a "grunt/yell". It helped me deliver more force to the ball, just as Paulyboy says. Sounds a bit funny, but it is a useful thing. Plus, if you deliver a great shot everybody thinks you're a monster for the rest of the game.

"STICK STICK, GIVE HIM A STEP!!!" hehehehe