Most workplaces nowadays have an induction prior to letting you loose,that induction would almost certainly involve manual handling technique and H&S procedures.
You're then put to task and practice almost certainly doesn't align with theory.This is when you present your TGWU convenors badge and say "**** this mate" I'm off to the pub and I'll pay my rent by credit card this month.
I was a shop steward with the TGWU for 10 years and an F.O.C in the print union many years ago.I've went toe to toe with more managers than some on here have had hot dinners.Workplace practice will never change in the manual workers line of employment,you do it or you don't...My educational acumen,attitude and certification dictated I did.