Some exercises commonly done in taekwondo classes include: * Jumping jacks (also called Star Jumps) - is a jumping exercise where the arms and legs are simultaneously brought together or spread apart during each jump; some people move the legs forward and back during a jumping jack instead of outward and inward; a half-jack is a jumping jack where you don't entirely bring your arms together at the top of their swing (which can cause shoulder injuries in some people). * Jogging - jogging around the dojang is a common way to warm up. * Wind sprints - while jogging around the dojang, sometimes an instructor will call for a quick sprint before returning to the jog; alternatively, students might form lines and sprint back and forth across the dojang as if racing. * Trick sprints -