The heart is perhaps the body’s most beautiful muscle. Roughly the size of a clenched fist, this amazing machine beats approximately 100,000 times in a day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times. This powerful pump circulates oxygen and nutrient-rich blood to every cell in the human body. Have a heart and take good care of your ticker. Follow these heart-healthy steps to live better and longer.