As a Noun: 1. Energetic movements which you do in order to become fit or remain healthy. English = exercise. 2. Simple exercises that you do to keep fit and healthy. English = callisthenics. 3. A form of exercise which increases the amount of oxygen in your blood, and which strengthens your heart and lungs. English = aerobics. As a Verb or Adjective: 1. To do energetic movements in order to become fit or remain healthy. English = exercise. 2. To do callisthenics. 3. To do aerobics.