True or false: cardiovascular endurance is defined as the boy's ability to use oxygen to meet energy demands of muscles through anaerobic exercise.
a. true
b. false

Cardiovascular is about the heart and its ability to pump blood around the body to keep us going. So when you're doing an exercise you begin to breathe harder getting your heart rate up which is cardiovascular endurance which pumps more blood around the body to the muscles so that we can continue our work out. The answer is true.