Heart rate refers to the number of times the heart beats in one minute. It is typically measured in beats per minute (BPM) and can vary based on factors such as age, fitness level, and overall health. A normal resting heart rate for adults usually ranges from 60 to 100 BPM. During physical activity or emotional stress, the heart rate can increase to supply more oxygen to the body. Monitoring heart rate is important for assessing cardiovascular health and fitness. Athletes often track their heart rate to optimize training and recovery. Devices like fitness trackers and smartwatches can help individuals keep an eye on their heart rate throughout the day, providing valuable insights into their health and well-being.