[noun] [U] - energetic physical exercises, often performed with a group of other people to music, which make the heart, lungs and muscles stronger and increase the amount of oxygen in the bloodI really enjoy (doing) aerobics.I go to aerobics (= to a class where we are taught such exercises) once a week.I have a very good aerobics instructor/teacher called Nicky.
AEROBICS
Meaning of AEROBICS in English
Cambridge English vocab. Кембриджский английский словарь. 2012