Middle school physical education classes in the United States typically encompass a variety of activities designed to promote physical fitness, health, and sportsmanship. The contents of these classes generally include fundamental movement skills, team sports, individual sports, fitness activities, and health education.

The curriculum aims to provide students with a well-rounded physical education experience that not only enhances their physical abilities but also instills lifelong health habits. According to the National Association for Sport and Physical Education (NASPE), the key components of middle school physical education should include:

1. Fundamental Movement Skills: These are basic skills such as running, jumping, throwing, catching, and striking, which are essential for participation in various sports and activities. They are typically introduced and refined in middle school to prepare students for higher-level sports and physical activities.

2. Team Sports: Sports like basketball, soccer, volleyball, and flag football are commonly included to teach teamwork, strategy, and fair play. These activities also help students develop leadership and communication skills.

3. Individual Sports: Activities such as swimming, track and field, and tennis are often offered to cater to students' individual interests and abilities. These sports can enhance personal skills and provide opportunities for competitive experiences.

4. Fitness Activities: These include exercises like calisthenics, yoga, and strength training, which focus on improving cardiovascular endurance, muscular strength, and flexibility. Fitness activities are crucial for overall health and can help prevent chronic diseases.

5. Health Education: Middle school physical education classes also incorporate health education to teach students about nutrition, injury prevention, and the importance of regular physical activity. This component is vital for fostering a comprehensive understanding of health and wellness.

Data from the Centers for Disease Control and Prevention (CDC) indicates that physical education in middle school is essential for promoting healthy lifestyles. For instance, a study published in the Journal of School Health found that students who participated in physical education classes were more likely to engage in regular physical activity outside of school hours. Additionally, the NASPE's "National Standards for Physical Education" emphasizes the importance of physical education in promoting physical fitness, motor skills, and personal and social skills.

In conclusion, the contents of middle school physical education classes in the United States are designed to provide a comprehensive approach to physical fitness, health, and sportsmanship. By incorporating fundamental movement skills, team and individual sports, fitness activities, and health education, these classes aim to prepare students for a lifetime of healthy living.