the.com/aerobics

means A form of sustained, rhythmic exercise (often done to music and in a group) designed to boost heart rate and lung capacity, aka cardiovascular fitness.

from Built from Greek 'aer' (air) plus 'bios' (life) — literally 'living on air,' referring to the oxygen-fueled metabolic process the exercise trains your body to use efficiently. The adjective 'aerobic' was coined in physiology for oxygen-dependent processes; it was popularized as a fitness term in the 1960s–70s, when a famous exercise program and book made the word (and the leotarded workout classes that followed) a household name.