What is Cardio?

Cardio exercise is any exercise that: 1) raises your heart and breathing rates, and 2) improves the function of your heart, lungs, and circulatory system. Cardio exercise: It makes you sweat. It makes you breathe heavy. It might even mess up your hair. Love it or hate it, cardio helps you stay fit and healthy. But what is cardio, exactly, and why do we need it? Most people think of cardio as a long, slow distance activity like running, biking, […]

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