Hi, I'm new here and scumbled upon this forum accidentally, but it seemed reasonable place to settle in.
But now to the point.
I have heard two types of suggestions about breathing while u get hit:
1) Breathe out, it tightens your muscles to maximise the protection they can offer and squeezes air out of the tissues.
2) Breathe in, while tightening your core muscles, while air in your body helps to defend the organs and works as an air bag between the abs and organs. And while u breathe in, step closer to the attack so u recieve less fiercer blow and may knock opponent unbalanced (if leg kicks).
In both ways it's possible to tighten the abs, but I really need to know which way is better? Usually been breathing out, but now I'm confused.
Try to give your anwser with reasonable explanations.