Going to the gym to send a small bracelet is for the needs of the coach's billing statistics. The bracelets issued by the gym have digital signs, and many members go to the gym for training. Some members will have classes at the same time on the same day. When the coach can't remember the name, he will record the bracelet number and inform the front desk. When a member leaves the wrestling ring in the gym, the front desk will inform the member to pay or record the number of classes according to the contents of the coach's remarks, which is convenient for the coach and the member to know the progress of the private education course, and has the function of a third party to record the number of private education courses fairly.