Aerobics and bodybuilding in physical education class are courses whose main purpose is to exercise and improve physical quality. But there are some differences between them.

Aerobics is an aerobic exercise, and its main goal is to improve the coordination of cardiopulmonary function and body. Usually accompanied by music, including jumping, turning and bending, it can exercise all parts of the body, including legs, abdomen, back and arms. This kind of exercise is very helpful for improving endurance and shaping body lines.

Bodybuilding is a kind of strength training, the main goal is to enhance muscle strength and endurance. It is usually achieved through weightlifting training and resistance training, such as weightlifting, weight pushing and weight pulling. This kind of training can exercise all parts of the body, including chest, back, arms and legs.

Body shape refers to a person's physical appearance, including height, weight and body shape. Body shape can be improved through diet, exercise and good living habits, such as diet control, aerobic exercise and strength training.

Constitution and health is a course content, which mainly includes fitness activities and mental health, fitness activities and personal health, aerobic fitness, muscle fitness, nutrition and health, energy and exercise, weight control scheme, environment and exercise, fitness activities and aging and longevity. These contents are designed to help students understand how to keep healthy and improve their physical function and adaptability through exercise and good eating habits.