The significance of a warm-up routine before exercise lies in its ability to prepare the body for physical activity. A proper warm-up increases blood flow to muscles, raises body temperature, and improves muscle elasticity, reducing the risk of injury. It also mentally prepares individuals for workouts by enhancing focus and readiness. Dynamic stretching and light cardio are effective components of a warm-up. Skipping this routine can lead to strains and reduced performance, emphasizing the importance of proper preparation before engaging in vigorous activities.