Running is primarily a form of cardio exercise, as it involves continuous movement of the large muscle groups in the legs and increases the heart rate. It also helps to improve muscular endurance in the legs and core. It can also contribute to strengthening the muscles in the lower body, however, it is not typically seen as a primary form of strength training. Flexibility can also be improved through running, as it helps to lengthen and stretch the muscles in the legs and hips.
