Final answer:
Swimming is considered a low impact exercise because it is performed at a moderate level of intensity over a relatively long period of time and provides buoyancy that places less stress on joints. It is a cardiovascular exercise that increases muscular endurance and cardiovascular health.
Step-by-step explanation:
Swimming is considered a Low impact exercise because it is performed at a moderate level of intensity over a relatively long period of time. Swimming in water provides buoyancy that places less stress on joints compared to exercises on the ground or other hard surfaces. It is a cardiovascular exercise that increases muscular endurance and cardiovascular health, making it an excellent choice for low impact aerobic activity.