Wendy K Wendy, I'm so glad you enjoyed and standing on the BOSU dome is VERY challenging. As far as air, the dome should be inflated about as high as 11" but you can adjust it up and down a bit to your liking. Just know the "squishier" it is, the harder it will be to balance while standing. Much love, Erika
Kathleen Fitzgerald Henry An original of mine from my first shoot at Pilates Anytime! Thanks for taking class with me Kathleen and sending you lots of love! Erika