No, according to Dr. Wang You's inquiry, using a catheter after fitness can increase the flow of blood and oxygen to muscles, help eliminate lactic acid and waste, reduce muscle soreness and fatigue, and thus promote muscle recovery and repair. After fitness, the catheter will not be practiced in vain. A catheter is a device that applies pressure to muscles. By giving muscle proper pressure and support, it can promote the blood circulation of muscle and shorten the recovery time of muscle fatigue.