The purpose of a cool-down after exercise is to gradually lower the heart rate and prevent blood from pooling in the muscles. A proper cool-down can help reduce the risk of injury, aid in recovery, and enhance flexibility. It typically involves gentle stretches and lower-intensity movements, allowing the body to transition from a state of exertion to rest. This phase also promotes the removal of metabolic waste products, facilitating quicker recovery and reducing muscle soreness. Overall, a cool-down enhances the effectiveness of the workout.