Which of the following is NOT one of the four major components of physical fitness?

The reason "Mind fitness" is not one of the four major components of physical fitness is that physical fitness primarily encompasses aspects that are directly related to the body's physical performance and health. The four major components typically recognized are cardiovascular fitness, muscular strength, flexibility, and body composition.

Cardiovascular fitness refers to the efficiency of the heart and lungs in supplying oxygen to the body during sustained physical activity. Muscular strength relates to the ability of muscles to exert force. Flexibility involves the range of motion available at a joint or group of joints.

Although mental fitness plays an important role in an individual's overall well-being and can influence physical performance, it is not categorized within the standard components of physical fitness. Consequently, "Mind fitness" does not align with the widely accepted framework used to assess an individual’s physical capabilities.