Try having no choice but to lift heavy crap alone because you're the only one on the dock. Try having a boss who, although he's no Mr. Olympia himself, think everyone should be able to deadlift a 400 pound load on their own and cart it all the way out to some creep's absurdly-lifted truck. These rules are like "In a perfect world, we would all lift from a squatting position and be able to ask someone for help. Wntil then, there's Worker's Comp."
Stay safe everyone, remember that minimum wage labour jobs--any job, really--isn't worth your life.