Eye opener as to how many here have back probs.
Im no different either, as i have a metal hip ( passenger RTA 1987 ) that occasionally nips a nerve. Bloody thing did it a week ago, and lm still struggling, though it does wear off eventually, after a week, normally nearer 2 weeks.
Add to that , i have a displaced disc at L4/5 so near the bottom of my spine, ( motorbike , lunched it 1994 ) and again, occasionally , it makes itself known. It's the the disc that gives me problems gigging, if the hip/nerve thing is ok.
I cant stand still in one spot for 2 sets, so as long as i have room to sidestep 2 paces left / right / forward / back, i can lessen the impact. I dont have any heavy gear to carry, depite me owning the PA subs and tops. 2 other band members deal with those. I have a Genz head and i dont use a cab, 2 basses are not ultra lightweight, but 4" straps help a lot. No speaker monitors either