When I was in my 200 yoga teacher training, I hurt my ankle and had to sit in a chair to do many of the asanas. I never imagine the depth of the three levels of chair yoga. I cannot imagine teaching chair yoga without being properly trained. Karen is a teacher comparable to the Himalayan Institute style of teaching. I would recommend her for anyone wanting to pursue chair yoga. There definitely is a calling for chair yoga and it is imperative to teach it correctly so as not to do harm to any student.