A.20 minutes
Experts agree that the minimum time period for cardiorespiratory benefit from exercise is 20 minutes. The term aerobic fitness and cardiorespiratory fitness mean and are described in a similar sense. In context, aerobic fitness or exercise or, cardiovascular fitness is process which involves the circulatory organs like heart, blood vessels, and red blood cells working with respiratory organs like the lungs in order to provide oxygenated blood throughout the arousing and activating muscles in an individual’s body and to provide energy.