Oh kevin, I do NOT envy you of all the nail pulling. I sweat....last summer...we pulled nails out of "reclaimed free lumber" I bet there are OVER 10,000 nails out there in 2 seperate bins. Some we have reused...some are bent, and not worth it. A few days of pulling nails will surely make the arms weak. My advice.....get a GOOD hammer, and a pry bar. The flat ones, that have the holes for nail heads....makes it alot easier to get those stubborn nails out. Good luck with it, and have fun!