Fitness is definitely good for health. As long as physical exercise is carried out, people's physique will be enhanced, and fitness can strengthen muscles, which will be good for bones and all aspects. But if the immunity is low, you can also go to a regular hospital to check the reasons. Under the guidance of a doctor, you can directly use drugs to improve your immunity and exercise at the same time. This effect is much better. If you only rely on fitness to enhance immunity, you may not reach the ideal level.