If two chairs fit a student better (or if you want to do a supported backbend but don’t have backless chairs), put out two mats criss-cross. Put the two chairs on the cross-wise mat with the edges of the seats touching. Put another folded mat on top of the chair seats.
You can sit on the seat, put one leg over to do poses like lunge and extended side angle, or even backbend over the chairs.
