This is because a medical device is a product that has been registered and approved by the State Food and Drug Administration for marketing and sale, with the primary purpose of preventing, diagnosing, and treating disease, as well as monitoring the physiological state of the human body and supporting life-sustaining medical purposes. And gymnastic gangs and throwing balls do not fall into this category, they are some sports equipment and toys, mainly used for entertainment and exercise.
If you need to use a medical device to treat certain diseases or conditions, you should do so under a doctor's supervision and use a registered and approved legal medical device. Otherwise, the use of illegal medical devices may adversely affect the body.
If you need to buy sports equipment or toys, you can choose regular merchants to buy them and pay attention to the quality and safety of the products. At the same time, you should pay attention to safety to avoid accidental injuries during use.
In short, gymnastic helpers and tossing balls are not medical devices, but you should pay attention to the quality and safety of the products when buying and using them to avoid causing harm to your body.