Cooling down is important after exercising to

Cooling down helps both your heart rate and breathing return to resting levels. This helps to avoid dizziness as well as fainting. Stoping suddenly is bad for the heart and can put stress on it.

Helps your heart rate and breathing to return towards resting levels gradually; helps avoid fainting or dizziness, which can result from blood pooling in the large muscles of the legs when vigorous activity is stopped suddenly helps to remove waste products from your muscle.

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