Hi, I would like to know what you think might be causing the pain in my calves. It happens only when I try to walk for cardio. exercise. Jumproping, or any type of exercise I use them for. It doesn’t hurt when I ride a bike, or use a crosstrainer. First they just get tight, then they start making me limp. When I stop exerciseing, the pain slowly goes away. I have tried changing my shoes, taking a anti-inflamitory before I work out. But it happens every time.