continuous activity that requires your heart and lungs to work together to supply oxygen to your muscles (with oxygen).
activity that requires short bursts of energy (absence of oxygen).
activity that increases your muscle strength and muscle mass.
activity that helps lenghten your muscles and improves your range of motion.
the muscle that pumps blood to all parts of the body.
the heart and vessels that carry blood to all parts of the body.
a part of air needed by the body.
part of the body that puts oxygen into the blood.
part of the body that thinks and makes other parts work.
part of the body that helps take wastes from the body.