A heartbeat is the rhythmic contraction and relaxation of the heart, which pumps blood throughout the body. Each heartbeat is initiated by electrical signals that travel through the heart muscle, causing it to contract and push blood into the arteries. This process is essential for delivering oxygen and nutrients to tissues and organs. The rate of a heartbeat can vary based on factors such as age, activity level, and emotional state. A normal resting heart rate for adults typically ranges from 60 to 100 beats per minute. Monitoring heartbeats can provide important information about overall health and fitness.