I've been suffering from a sore lower/mid back for a while now and it is starting to affect my golf game for the worse. I've started to hook the ball more and more since i've been dealing with this back pain and I think this is because my posture has changed when setting up to the ball. I've notice that I have been setting up farther away from the ball and getting a more hunched over back. When I corrected my posture and got closer to the ball, it instantly felt familiar and I hit the ball 10x better. The problem is when swinging with a more upright spine angle, the pain in my back is much more intense. (i know, i thought it'd hurt more while more hunched over) The pain intensifies on the downswing and is triggered by my bodyweight moving to the left and the hips clearing. I've always heard that stretching your hamstrings will help a sore back, so i've been doing that religiously for a few weeks now. I'm looking for any stretches or warmup movements that will help me ease this awful pain. Thank you in advance for any advice/knowledge given!