cardio

adj

1. (not-comparable)Cardiovascular; pertaining to the health of the circulatory and respiratory systems.

noun

1. (uncountable, usually)Exercise with the goal of raising the heart rate by walking or running on the treadmill.

   “I did some cardio today instead of lifting weights.”

   “For decades, trainers and scientists have debated whether and how to mix cardio and resistance exercise. Some small studies suggest combining the two might up the likely gains from each, especially the resistance training.”