My dad is a logger and was a mechanic; he's almost 61 and "retired" for two years. He thrashes along six or seven days a week, cutting on two different jobs, w

My dad is a logger and was a mechanic; he's almost 61 and "retired" for two years. He thrashes along six or seven days a week, cutting on two different jobs, with a cable skidder and chainsaw - so he's jumping up and down, sawing, and pulling cable all day. I'm amazed at how hard he can work, but he's always been a bull. I think he's afraid that if he slows down, he's not going to be able to start back up. Or maybe it's just the way he is. Only issue he's really had is that the years of power tools and vibrations got to his wrists and hands, so he had to get carpal tunnel surgery.