453,600 Pounds is about the amount of metal products I have taken to the yard in 3 years all lifted by me in and out of the truck, yanking moving doing .Now in all this time I can't say I really hurt my self as I am careful But for the last 4 months i am getting some pain in my elbows , & I also don't feel as strong lately (but still getter done) Does any one know if this work slowly wears you out ?