The purpose of warm-up and cool-down routines is crucial for safe and effective workouts. A warm-up gradually increases heart rate and blood flow to muscles, preparing the body for more intense physical activity. It helps prevent injuries by enhancing flexibility and range of motion. Conversely, cooling down post-exercise aids recovery by gradually lowering heart rate and preventing dizziness. Stretching during cool-down can reduce muscle tightness and soreness, making both routines important components of any exercise regimen.