Does all this hard physical labor effecting my low back? I did loading, unloading boxes some weighing 150 lbs at rate of 400-700 boxes per hour and my doctor said you are setting up yourself for low back pain. Is that true? Is my back giving away? Is 8.50 cents for starters worth it? Ho wmuch does a manager gets? I mean they don't do anything and if i could get paid that much for next to nothing work, I am more then glad to work something out to become a manager.