First of all, consider the cost. The rent will account for a large part, and then there is the problem of cold and warm. The cost of opening or opening space will be too high, followed by management. Now it's all for profit, and the operating cost of small space will definitely be small. There are many outdoor fitness places abroad, but they are all non-profit and there are many other factors. For example, in winter, after class, you are sweating all over, and the air temperature and airflow in the closed space are relatively stable, so there will be no hot and cold phenomenon.