Heart rate refers to the number of times your heart beats in a minute. It can vary based on several factors, including your age, fitness level, and emotional state. For example, when you exercise or feel excited, your heart rate increases to supply more oxygen to your muscles. Conversely, when you are resting or sleeping, your heart rate slows down. Monitoring your heart rate can provide valuable insights into your overall health. A normal resting heart rate for adults typically ranges from 60 to 100 beats per minute. Keeping track of your heart rate during activities can help you understand your fitness level and improve your exercise routine.