Final answer:
Aerobic exercise is physical activity that uses muscles at sub-maximal strength levels for extended periods, enhancing cardiovascular fitness. Examples include running, swimming, cycling, and brisk walking.
Explanation:
Aerobic exercise, also known as cardio, is any physical activity that uses muscles at less than their maximum contraction strength but for long periods of time. It primarily relies on the aerobic energy-generating process, requiring free oxygen to meet energy demands. Examples include medium to long-distance running, swimming, cycling, and brisk walking. Aerobic exercise aims to increase cardiovascular endurance and utilizes slow-twitch muscle fibers that consume large amounts of oxygen.
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