I have two different set up.
I have a chair and a 6 foot ladder to get me in the air.

All three.

I shoot from a stool (turkeys)
I have a 12 ladder stand.
I practice from the ground, standing.

sitting,stranding, kneeling and from a stand plus any other way I can think of at the time.

I chose standing for the pole cause that is how i practice the majority of the time, but i do practice from my treestand as well as sitting, kneeling and any other variety or shots i can think of.

sitting, from in a blind
standing
off the deck

I don't hunt from a treestand so I don't pratice that. I try to mix up on stances that would be a most likely scenerio out in the field. I'll pratice standing, kneeling, sitting, snap shooting, etc etc

All three plus kneeling.

Sitting, standing, from an elevated platform, kneeling, leaning around obsticles, drawing almost paralell to the ground and then rising up...

I practice in as many different ways I can think of.

usually standing on my deck thats about a foot and a half off the groud. when hunting season gets closed i will start to shoot sitting or kneeling because sometimes i hunt out of a blind.

I practice standing upin my treestand and standing on the ground as well