i did my back in few years ago leaning under shelves pulling 25kg bags out to make a pile of 56 . Id been working there for over half a year before it happened and moving over 300+ aday. God the pain. If i tryed running i would of past out, getting out the car after work was a killer. I carryed on working in pain and after 2 weeks it was better. Using it is the fastest way of it getting better.