aerobics aerobics /ɛəˈroʊbɪks/

noun

1. Exercise that increases the need for oxygen  ( aerobic exercise , aerobics )
   exercise that increases the need for oxygen
    She worked up a sweat in aerobics class, dancing and moving to the beat of the music
   She worked up a sweat in aerobics class, dancing and moving to the beat of the music
   
   

 aerobic aerobic /ɛˈroʊbɪk/

adjective

1. () Depending on free oxygen or air  ( aerophilic , aerophilous , aerobic )
   depending on free oxygen or air
    Aerobic fermentation
   aerobic fermentation
   
2. Based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency  ( aerobic )
   based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency
    Aerobic dance
   aerobic dance
    Running is very aerobic
   running is very aerobic