Physical fitness refers to a person's overall health and physical condition, including their strength, endurance, flexibility, balance, and coordination. It is often measured by various tests that assess different aspects of one's physical abilities, such as body composition, muscular strength, aerobic capacity, and flexibility. Physical fitness is important for maintaining good health, preventing chronic diseases, improving mental well-being, and enhancing overall quality of life. It can be achieved through regular exercise, a balanced diet, proper rest, and stress management techniques.