Physical education, often abbreviated to Phys. Ed. or PE, and sometimes informally referred to as gym class or simply just gym, is a subject taught in schools around the world. PE is taught during primary and secondary education and encourages psychomotor, cognitive, and effective learning through physical activity and movement exploration to promote health and physical fitness. When taught correctly and in a positive manner, children and teens can receive a storm of health benefits. These include reduced metabolic disease risk, improved cardiorespiratory fitness, and better mental health. In addition, PE classes can produce positive effects on students' behavior and academic performance. Research has shown that there is a positive correlation between brain development and exercising. Researchers in 2007 found a profound gain in English Arts standardized test scores among students who had 56 hours of physical education in a year, compared to those who had 28 hours of physical education a year.