There are several swimming pools in Tongzhou, such as Xihaizi, Moon River and Luhe Middle School. There is a sports university in Longwangzhuang and one in the university. But I suggest not to go to Xihaizi, which is open-air and not very good. There is a Jianlongsen Gymnasium on Binhe Road, where there are also teachers, who seem to handle cards, and there are many other projects. Moon River is about 200 yuan more expensive than other institutions, but the teaching is OK. There has been one behind Luhe Middle School for many years. I suggest not to go at ordinary times. Usually, couples in the pool are annoying and have a bad influence on children. Near the Xinhualian subway, there is a golden fountain and a swimming pool, which is not bad. I hope I can help you.