I've just transfered into a barback job, I frequently have

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I've just transfered into a barback job, I frequently have to pick up box-shaped objects at some strange angles and need some advice on NOT fucking my back.

>having to grab cases of beer in a fridge that is 6 inches shorter than me, theres a solid pillar in the center, and the cases are partially behind said center
>having to grab a big bin of ice I shovel in and load into a larger bin on wheels, grabbing in one area usually allows me the classic front-squat type form, the other one has uneven footing because of the drain on the floor being elevated

These things in combo have made my middle/lower back crackle like popcorn when I twist some days and have it be swollen as fuck when I get home other days. This makes me afraid to go back to the gym and deadlift because then I'll have fucked my disc and theres no workers comp to apply for. pls help /fit/, my job is a gainz stealer and possibly bodybuilding journey ender!