All of the following are positive effects of cardiorespiratory fitness except

A. preventing low back pain

B. strengthening the heart

C. reducing heart disease risks

D. using energy stored as fat

By definition, the term cardiorespiratory fitness is usually used to refer to our body's circulatory and respiratory system to work as efficient as possible in supplying oxygen to our muscles even when under extreme stress. In addition to that, another benefits of promoting this kind of fitness would be to reduce the risk of heart attack.