Vesuvio wrote:What are you sitting on? Does it provide firm support?
I think your dance teacher had a point. As guitarists we do tend to sit still for long periods and I think the key to doing so without problems is to make sure our posture is relaxed and balanced, rather than being maintained through muscular action.
I usually practice sitting on a desk chair. I noticed a tendency for my left "cheek" to go to sleep on me using a footstool after a while, but have never had a problem with the Dynarette.
The padding on the desk chair had compressed somewhat after a few years of "power sitting". Hubby bought a new one (ours were the same age) but ended up returning it, as it exuded a noxious odor apparently from the infused fire retardant chemicals.
He bought a Tempur-Pedic cushion designed for use with a wheelchair to use with his old chair and was so happy with it, he bought me one, too. Ain't love grand? It doesn't get much more romantic than someone buying you a butt pad to sit on.
I can honestly say it makes a big difference in sitting comfort and helps relieve any pressure on the posterior caused by a harder surface. Of course, posture still matters a lot.