i worked my belly breathing to perfection using this wedge http://www.bedexpert.co.uk/products/bed_expert/tempur/accessories/index_33.html
it gives about the same result as a knee chair, but the person’s feet in the picture should be under the seat. http://www.sitincomfort.com/kneechairs.html
my backs as straight as a pine on these, while my upper arms are close to my body.
the only tension is where it should be, on the belly.
BTW: it’s hard to drag a knee chair around 
I don’t know about the wedge, but I tried one of the knee chairs years ago when racquetball was first starting to destroy my knees. The pain was intense and lasted after I quit.
They may be fine if you’re young and have good knees, but if you’re past forty and the knees are going, I would NOT recommend it.
I tried employing my meditation cushion for playing whistle . . . it’s a great idea, as it throws the shoulders back and open the chest for easier breathing. It’s less tiring than sitting in a chair, as the spine supports the back effortlessly.
It also flattens the abs without situps.
The only disadvantage to it is sitting on the floor, which may be diffucult for some. The posture takes a little getting used to.
I have the buckwheat smile cushion, which gives more area for seating.
anybody tried one of those balls? A number of folks at work sit on them.
http://www.bodytrends.com/bldgymnc.htm
No endorsement of this vendor, it just came up early in a Google search.
chuck, you don’t use your knees on a wedge seat.
with a knee chair, you don’t lean on your knees, but the lower part of your legs.
but i personally prefer the wedge.
it gives about the same result as a knee chair, but the person’s feet in the picture should be under the seat
Oh, I love those chairs! I used to work at a store that catered to people who had either had back problems or were trying to avoiding causing them. We mainly sold chairs, all kinds of chairs, including the knee chair. I used to work in assembly, and put together knee chairs all the time, I always had to sit in them after I was done (testing the equiptment, ya know 
) (and if you think they’re hard to drag around under normal circumstances, trying dragging around three or four at a time through a showroom)
anybody tried one of those balls? A number of folks at work sit on them.
We sold those to, well not that brand, but the same idea. Personally, I never much liked them, preferring my furniture to stay in one place if I leave it alone :roll: , and I would keep falling off Anyway, I never did ask what exactly what made them so good, so I’m totally clueless to their theriputic value
this bump is justified, being the answer to many questions.
it’s just down to basic belly breathing, pull in your belly when you blow and let it go when you inhale, and open your mouth at the same time.
but try it on a wedge or knee chair.
A wooden seiza bench is also good.
I’ve found that when it comes to playing flute,
nothing beats standing up.