After a class that reviews revolved triangle sufficiently, this partner pose can be introduced. The front student finds a well-aligned revolved triangle, and the back student sets up in chair pose. The back person has to scoot in enough so she can actively squeeze the leg because this is what is keeping her from falling backward. The chair pose person leans back and takes arms up or can explore other options.
For the person in chair pose, another nice addition is to press gently into the partner’s upper arm to increase the rotation.