The purpose of a cool-down after a workout is to gradually lower the heart rate and return the body to a resting state. This process helps prevent dizziness or fainting by allowing blood to flow back to the heart and muscles from the extremities. A cool-down also reduces the risk of muscle stiffness and soreness by promoting the removal of metabolic waste products, such as lactic acid. Additionally, it provides a mental transition, allowing the individual to reflect on the workout and plan for future sessions. Stretching during cool-downs enhances flexibility and aids in recovery.