Relating to both the heart and the lungs, especially their combined function in pumping blood and exchanging oxygen throughout the body.
From cardio- (heart) and respiratory (Latin respirare, to breathe). Compounds cardio and respiratory to describe integrated pulmonary and cardiac function.
When you do cardio exercise, you're training the entire system—your heart pumps harder, your lungs breathe faster, and oxygen delivery improves together in a coordinated dance.
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