Personally I agree with this. I used to get a sore back after every rehearsal sitting with one leg up, but no longerEFischer1 said:I play with both feet on the floor which, I know, is somewhat controversial. The benefit of this posture is that it evens out your hips and allows you to relax the tension out of your back. It requires that you sit on a lower stool (26-28") but it may be worth checking out.