You can go to Aso Yoga Hall in Nantu Street at the entrance of Kaifeng University. I have friends practicing there. It seems to be the first yoga studio in Kaifeng, which should be very professional. A few days ago, I went there with my friends to pay the fee, and found that there were many students, which should be worthwhile. You can go and have a look. It seems that we can try a class first. I hope it helps you.