Tracking heart rate during exercise serves multiple purposes, primarily ensuring safety and optimizing performance. Monitoring heart rate helps individuals maintain their effort within specific training zones to achieve fitness goals, whether it's fat burning or improving endurance. It allows for adjustments if the heart rate exceeds or drops below target levels, ensuring efficient workouts without overexertion. Furthermore, consistent tracking can provide insights into cardiovascular improvements over time, guiding future training adjustments and enhancing overall physical health.