cardio

1. not comparableCardiovascular; pertaining to the health of the circulatory and respiratory systems.

plural cardios

1. uncountableusuallyexerciseExercise with the goal of raising the heart rate by walking or running on the treadmill.

   I did some cardio today instead of lifting weights.

   1 more example

   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.

   2021 November 3, Gretchen Reynolds, “Cardio Before Weight Lifting May Help Boost Muscle”, in The New York Times, archived from the original on 20 Mar 2022

   Synonyms: endurance training, monostructural work, metabolic conditioning