The advantage of stretching coach lies in focusing on improving the flexibility and flexibility of the body. They have a deep understanding of human anatomy and physiology and can design and guide effective stretching training programs. Proper stretching exercise can increase the range of motion of joints, improve posture and body symmetry, and reduce muscle tension and discomfort. Stretching coaches can also help prevent sports injuries and promote rehabilitation and recovery. The advantage of a fitness instructor lies in paying attention to overall health and physical training. They have rich fitness knowledge and experience, and can make personalized training plans, including strength training, aerobic training and core stability training. Fitness instructors can help clients achieve the goals of body shaping, increasing muscle strength, improving cardiopulmonary function and reducing fat. They can also provide correct exercise skills and posture guidance to ensure the safety and effectiveness of customers during exercise. Therefore, stretching instructors and fitness instructors are all good.