Cardiovascular exercise can be divided into high-impact and low-impact exercises, which refer to the degree of impact an exercise has on your joints and skeletal system.
When moving your body has to absorb the force of the impact with the ground. The higher the impact with the ground, the greater the force/ shock your body (particularly your ankles, knees, hips and lower back) must withstand. Significantly less stress, or jarring, is exerted on your body and joints when you land during low-impact exercise and there less risk of injury compared to high-impact exercise. This means that when you do high-impact exercise you need to pace yourself and advance more conservatively in order to avoid injury compared to low- or no-impact exercise programs.