cardiocar‧di‧o /ˈkɑːdiəʊ $ ˈkɑːrdioʊ/ noun [uncountable] informal 
any type of exercise that makes the heart stronger and healthier, for example running: 
a combination of cardio, weight training, and kung fu
any type of exercise that makes the heart stronger and healthier, for example running: a combination of cardio, weight training, and kung fu