Finished drywall on a Saturday and my lower back locked

https://jasperwmpc235.wpsuo.com/knee-replacement-recovery-in-north-york-first-weeks-through-a-physio-s-eyes

Built drywall on a Saturday and my lower back locked, I told myself it would pass until week three when a massage during physio finally let me bend without stabbing pain, weird that it took that long.