Usually my first day back at work for full time mowing is filled with equipment tweaking, customer problems and all around bad luck, Today was my first day back. Im doing the backyard of my first house, everything is going good... My back locks up. I get 5 more yards done before the pain is so excruciating that Im getting dizzy. Now I get to spend the next 36 hours on my hardwood floors trying to get it back into place. TYPICAL!