I haven't seen anyone mention the effect of childhood polio in one limb on the other limb. My left leg is 4cm shorter and weaker by far than its partner, which has suffered from overwork for 70 years. This has not stopped me in the past from living an active life, but has now given me chronic pain from right calf to right upper back. I am golfing with a buggy for the first time, albeit reluctantly. My osteo has recommended an exercise bike to try to strengthen Lefty and help out Righty, but I'm not holding my breath. Does anybody use one, if so with what results?