Final answer:
Aerobic exercise involves using muscles below their maximum strength for extended periods to improve cardiovascular endurance.
Explanation:
Aerobic exercise is any physical activity in which muscles are used below their maximum contraction strength, but for long periods of time. Aerobic exercise uses a relatively high percentage of slow-twitch muscle fibers that consume a large amount of oxygen. The main goal of aerobic exercise is to increase cardiovascular endurance, although it can have many other benefits, including muscle toning.
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