The term "maximum heart rate" (MHR) refers to the highest number of beats per minute (bpm) a person’s heart can safely achieve during exercise. Calculating MHR typically involves subtracting one’s age from 220. Understanding MHR is crucial for training because it helps individuals monitor exercise intensity, ensuring workouts are effective and safe. Target heart rate zones, defined by a percentage of MHR, guide training regimens tailored to individual fitness goals, whether for improving endurance, fat loss, or general health.