Hello,
I had to unexpectedly move from Beijing and therefore selling my swim and gym card in 21st Century Hotel Swimming pool (Sino-Japanese Youth Center) in Liangmaqiao. The 50m swimming pool was built for the olympics and is in good condition, not super crowded either due to a relative high price level costing 98 RMB per entry. Apart from the swimming pool there is also a small gym, sauna and a big jacuzzi.
The card is valid for another 1,5 years and have over 70 entries left. You can also bring your friend/date on the card without any extra fee, it would just count as two entries rather than one. So it's a very flexible set up.
New price for a 100 times card is 6,000 RMB. I now sell this 70+ times card for 2,000 RMB. Perfect with swimming and jacuzzi in the cold winter of Beijing..