A recommendation
I've been sitting on a "rolling desk chair" for years. I tried the bouncy ball for a while... no dice. Really mostly stressed me out.
There's a lot of really expensive yoga chairs out there if you wanna get Fancy. I'd love to try one of those some day but I recently made the switch to just the simple IKEA tripod stool. And honestly...it's great. Stable, but free movement. I can get all my wiggles (kriyas) out while I'm sitting through meetings. It's grrrrrreeate! (best Tony impression I got).
Give it a try?
KYRRE stool, birch - IKEA
KYRRE stool, birch This stackable, 3-legged stool with bent legs and triangular-shaped seat is a great little accent that’s comes in handy when you need extra seating for guests or a place to unload your cup of coffee or tea!
IKEA
This was recommended to me by my former pilates & gyrotonics (which is pretty fun BTW) instructor in ATX. @Vanessa, thank you!