I would say cardiovascular fitness. Cardiovascular fitness is what makes you able to have muscular strength, and flexibility, and those fitness components. <span>Cardiovascular fitness is the ability of
the heart, blood cells and lungs to supply oxygen-rich blood to the
working muscle tissues, and the ability of the muscles to use oxygen to
produce energy for movement. It's basically what makes you able to excersise. </span>~Deceptiøn
