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The heart is one of the most important organs in the human body. Its main job is to pump blood around the body. An adult heart is approximately the size of a person's fist. A normal resting heart rate for an adult is usually between 60 and 100 beats per minute. However, the heart can beat much faster when a person exercises. If a heart beats 70 times per minute, it beats more than 100,000 times in 24 hours. Physical activity can help keep the heart healthy. Doctors also recommend eating a balanced diet, getting enough sleep and avoiding smoking. Although the heart is quite small, it works continuously throughout a person's life.