The goal of a cool-down phase, after an aerobic is to decrease heart and breathing rates, gradually cool body temperature, prevent venous pooling of blood in the lower extremities, which might cause dizziness or possible fainting, otherwise.
Adequate time for an aerobic cool-down phase is 5-10 minutes.
A cool-down phase provides the body with a smooth transition from aerobic exercise back to a steady state of rest. Essentially, a cool-down is the opposite of warm-up. This portion of a workout is quite often overlooked by many people and seen as less important than other parts of a workout. However, proper utilization of the cool-down phase can have a major impact on your overall health.
Cool-Down Activity Suggestions: