Pulling the carts SUCKS

I’m normally not a complainer, but is anyone else’s lower backs hurting? I just noticed this morning how bad my lower back is aching from pulling these heavy carts, and my shoulders hurt too. I used a foam roller last night and that kinda helped.
But the back pain is getting unbearable especially when I know it won’t hurt to push.
I told an overnight coach today that I’m going to have to push it because my back strain is killing me and I’m an hour into my shift