Your left knee is so important in the backswing 🏌️ What it did for me is allow my shoulders to point down at the ball and not flatten out at the top. I used to struggle with staying in posture, having a shut face, laid off and flat in the backswing for number of reasons. The lack of left knee movement was one of them. You want to start by just getting the motion down with just the lower body first. No club and not shoulder rotation. Just feel your left side being slightly more relaxed than your