Having a warm-up before strength training is significant as it prepares the body for physical exertion. It increases blood flow to the muscles, enhances flexibility, and raises core temperature, reducing the risk of injury. A proper warm-up gradually acclimates the body to the demands of strength training and improves overall performance. It can include dynamic stretches or light aerobic activity, ensuring the body is ready for intense movements. Thus, a warm-up is essential for optimizing workout effectiveness and ensuring safety.