The significance of stretching in a fitness routine lies in its numerous benefits for physical performance and overall health. Stretching helps to improve flexibility, which can enhance movement efficiency and reduce the risk of injuries. It also aids in muscle recovery by increasing blood flow and relieving tension. Incorporating stretching into a warm-up and cooldown routine prepares the body for exercise and aids in relaxation. Furthermore, regular stretching can improve posture and enhance balance, contributing to better overall physical functioning and well-being.