I was an eight-mile-per-day walker and runner for thirty years, being unaware that I have one leg shorter than the other, and when severe problems began, was told that I have a leg length discrepancy and the LAST thing I should have been doing was ambulatory exercise. I lived for it. The endorphin rush made me happier than the disco dancing of the seventies. To my horror, I had severe hip pain one day, and after many consultations, learned that I have spinal arthritis, scoliosis and stenosis, and the last thing I should have been doing was weight-bearing exercise and was told to lie down! All the time. As in no weight bearing. I spend my life in bed reading, watching tv or being online. I made the rounds of spine surgeons , both in South Jersey and Phila. I considered going to New York when they all agreed that there is no spinal remedy and to just avoid any weight bearing. You never know what life is going to hand you. When you think you are doing excellent things for your body, it can be the opposite. It sucks