Xin Kai's health is quite good. I used to work there during the summer vacation. There is no charge for those courses. You just need to know what time there is a class every day, and then go. You can ask the front desk for the class schedule, or go to the front desk to have a look. There is a timetable posted there. When the spinning is hot, you need to go to that number in advance to get a seat. I don't know if there are so many people now, all of them are free.

I hope I can help you, and I hope you are getting healthier and healthier.