When are you most comfortable? Sitting in a hardwood chair or a bean bag chair?
My classroom is set up with flexible seating. What this means is that my students have options to sit in something other than a chair. They could stand, sit on the floor, sit on a futon, jump on a trampoline, etc. This gives students more ability to concentrate because they are choosing something that will help them focus. Students will not have assigned seats and may change their seats multiple times a day depending on how they are feeling. I do have regular seats available for students who get distracted from the diverse seating options.