Aerobics is rhythmic exercise done to music in a class. An aerobics class, do aerobics, aerobics instructor.
It takes a singular verb: aerobics is hard work. The name comes from aerobic exercise, meaning exercise your body can fuel with oxygen, as against the anaerobic sort that burns through what is stored. The class form belongs to the 1980s above all.
1nounaerobicsRhythmic exercise done to music in a class.
“She goes to an aerobics class every Tuesday evening at the gym.”
aerobics is an exercise.
From aerobic + -s.
Etymology from Wiktionary, CC BY-SA