Originally Posted by RandomHero1090

Wider stance makes it harder to turn. So, if you stop turning and slide/thrust the hips forward, you will come from WAY inside with an open clubface (push-fade, push-slice). If you try to save the shot with the arms, you will come over the top with a closed face (pull hook).

For my driver, I set up with the insides of my feet in line with the middle of my shoulders.

I find that I stay with the shot more with a narrower stance. I'm not talking super narrow, just a very athletic position, like I was fielding a ball as a shortstop.

Too wide, hips don't turn right. Too narrow, you don't have enough width to keep balance.