I have been practicing at home for 8 years with Huilan yoga discs, and I feel very good. I haven't been hurt, although my body is not flexible. Because the instructions of Huilan yoga disc are very clear, telling practitioners to practice according to their own comfort, so I have never been injured in the process of following the practice. In fact, only I know my body best, and the coach won't guide my feelings, so no matter where I practice, I can practice safely as long as I pay attention to my body feelings.
Fortunately, I chose Huilan yoga disc from the beginning and learned safe and effective practice. Her voice is very soothing, and I don't have time for class. It is most convenient for me to practice at home.