Of course, I am also a beginner, and I can't tell whether the teacher is professional or not. That's what our yoga teacher told us when I was practicing at school.
She has been practicing 15 years, and now she is over 40. When she went to the hospital for a physical examination, her figure, especially her waist, looked like a person in her twenties.
There is a Shang Ning Yoga in Sun City, Changzhou New District. I'm an intern there now. I hurt my knee when I was practicing outside. Later, I was introduced to Shang Ning Yoga by a friend, and I was not injured. The ancient teacher in Shang Ning heard that she had taught yoga for more than ten years and had a deep understanding of yoga teaching.