I was a horseshoer for years. Some days I would come home stooped over and hurting really bad. Most of the time a run or a bike ride would make my back feel better. My back finally got so bad I had to change professions. No that I make knives for a living, my back doesn't give me much trouble most of the time but I no longer have any feeling in part of my right knee. Running and riding my bicycle still keep me feeling good though.