Q.I love walking, but I always seem to get some kind of injury or pain. It’s my ankle now. I think I stressed a tendon or ligament when stretching during my walk to relieve calf cramps. Last time it was my back. I always walk a few days and then I’m laid out with pain or injury. I am 48 years old and 30 pounds overweight, and I quit smoking seven months ago. I really want to walk. Can you give me some proper stretching and exercise techniques to stop these setbacks?