I have been having an issue with my left calf cramping and twitching after I do higher impact exercises. After I did Intensity had a charlie horse trying to take hold but I would stretch and that helps but then it will twitch. This went on for a few days. If I stay with low impact it does not happen. I love to do higher impact a few days a week, but with this cramping going on it makes it not fun. Any suggestions would be great to help with this. Running really does me in, so therefor I do not run anymore. But I love the Intensity and Imax's and do not want to give them up. Help!!!