I taught this once today and going to teach it again later today and tomorrow morning. I will say I had to have the box over the shoulder rests on 2 of the Reformers because there wasn’t enough room for the knees to be on the carriage. Those 2 Reformers also had towers, so I really had to watch them so they didn’t bonk their chin or head. The other 4 people were on Allegro 2 Reformers and it worked out fine. Lastly, everyone had different torso lengths and some were more comfortable than others.