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If you are interested in health and fitness, you are probably already taking physical education classes and involved in sports activities. It is also important to take nutrition courses. Business courses can help you prepare for the management aspect of running your own personal training service. Science courses such as biology, anatomy, chemistry, and physiology are important for your understanding of muscle groups, food and drug reactions, and other concerns of exercise science. If you are not interested in playing on sports teams, you may be able to volunteer as an assistant. These positions will allow you to learn about athletic training as well as rehabilitation treatments.