If only I could be 20 years old again…. out until 2am, in the gym at 7am and do it again the next day.
The term cardio is short for the term “kardia” which is a Greek word for the heart. So the cardiovascular system is your heart and all your blood vessels. Initially, doing cardio work was work to improve your heart and blood vessels. But rarely do I think people do cardio because they’re concerned about making their heart healthy or think something like “I need to improve my heart today, I’m going to do some cardio.”