That's it. I have hit old man status. After doing good mornings regularly for the last 20 years or so, I finally have broken. A week a go I felt a small twinge doing them at the end of my squat day. Today, I felt like I was going to die after rep one. After rep four, yes I am that dumb, I gave out. Thankfully I can still hobble around, but never again. I've been doing them so long I have no idea for a replacement. I am not going to dry hump the air like a 14 year old girl, so don't suggest hip thrusts. Any other ideas welcome.