I do not go to Gym, but I go to Wuhua Square sometimes to have my rope skipping exercise. It's really a good place to have morning or evening exercise every day. You can breath fresh air on Square!
I think there may be some experts in Colorful Yunnan Trade Center for Jade and Gem, which is a big Jade trade market on southeast Kunming. Maybe they could help you with it. But I'm not sure if they need your payment.