Cardio is the medical term used to reference the heart. From Greek kardia: heart. The Greek spelling using k is the reason for the usage of K in EKG (electrocardiogram). The heart and lungs, from an older edition of Grays Anatomy. ... Lead II An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which records the electrical voltage in the heart in the form of a continuous strip graph. ...

Also used in reference to exercises and/or equipment intended for cardiovascular fitness and endurance training (aerobic exercise). The circulatory system or cardiovascular system is the organ system which circulates blood around the body of most animals. ... Physical fitness is an attribute required for service in virtually all militaries. ... In physical exercise, Aerobic exercise is complementary to anaerobic exercise. ...

External links

• http://www.doitsports.com/vt/program-day-view.tcl?target_day=88&program_id=502
• http://exercise.about.com/cs/cardioworkouts/a/cardio101.htm
• this information is all false and you should not listen to it because it's a bunch of nonsense