That is something that is strangely very very hard to do, as the natural reaction most people have when countering an incoming force is to push back against it or try and push back on an angle of some kind from the point of contact. It takes a while to unlearn this response in a static position, and even longer in a dynamic one.
that's an understatement. this is so very hard to do. i didn't figure this part out until not too long ago. it takes alot of mental control to override the natural response that we imprinted in our body for so long. just the other day, i was fighting very hard to control my natural responses, but then i realized it created more tension, so i told myself to "let it go and don't fight it!" i feels good afterward. and my wife said "i can't believe you ate the whole pizza!"