Where is a free swimming place in Beijing?

Yingdong Swimming Pool Address:No. anding road 1 Asian Games Village, Chaoyang District Tel: 649 12233-537 Opening hours: 10: 00-22: 00 Consumer reference: Good facilities, Hot Water Shower Monthly Card 300 yuan (30 hours) Address: 30 yuan, Haidian Gymnasium, Haidian District Tel: 62642626 Opening hours: Monday to Friday 12: 00 Sauna Bath Gym with Hot Water Consumption Reference: 15 yuan 1 .5-hour Cuigong Hotel Swimming Pool Address: No.76 Zhichun Road, Haidian District, Beijing Opening Hours: 07:00-24:00 Consumer Reference: 25m* 12.5m 50 yuan/2-hour Zhongguancun Swimming Pool Address: Nansan Street, Zhongguancun No.320 Terminal, Haidian District Tel: 62565 105 Opening Hours: 6544825 a.m. .7-2.0m Consumer reference: annual card is 2400 yuan, season card is 800 yuan, and leisure card is 460 yuan Sigma Building Fitness Club. Opening hours: 09:00-20:00 Consumer reference: 6m*20m, steam sauna 75 yuan Infinite Dazhong Temple Swimming Pool Address: Inside Dazhong Temple, Haidian District Tel: 62573285 Opening hours: 65435.