Warming up is vital before physical activity as it prepares the body for the upcoming exertion. A proper warm-up increases blood flow to muscles, elevates heart rate, and enhances flexibility. This gradual increase helps in reducing the risk of strains and injuries, particularly in cold or stiff muscles. Additionally, warming up mentally prepares the body for exercise, improving concentration and performance. Overall, warming up creates an optimal state for the body to handle physical stress, leading to better workout results and reduced injury risk.