It's designed for people from 5 feet to 5 feet 11 inches tall, and comes with a classic exercise ball, chair assembly materials, air pump, and office chair exercise guide. The ball is removable from the chair, so you can also use it alone, and if you need a longer chair, Leg extensions That adds 2 inches available separately!
Promising reviews: “This chair is much more than just a perforated line Portland. I have used it for over a year in my office job. Look funny? certainly. But this is not for them. It's about my health and lower back strength. For the first few weeks, I had a “regular” chair nearby to make the transition easier. Now I wish I could take my chair with me to client sites. I used to “sit” with my chair all the way under the desk, leaning back, so that my butt and shoulders were the only thing supporting me. This balance chair forces you to sit up straight and support yourself. It will force you to strengthen your legs, back and shoulders. You'll find yourself sitting straighter even when you're not using a chair.” –Micah
“This allows me to work a little on my core strength just by doing what I do for 8.5 hours a day, anyway. I can also navigate with music while on the phone, which is a big plus. If I had the money I would buy this for everyone I know. It's very comfortable, and I don't see myself going back to the chair I was in before, which makes me feel very tired and lethargic. The biggest thing I've noticed is the difference in my back pain. I feel stronger, and I don't slouch as much when I sit in a regular chair.” –Brittany Austin
Get it from Amazon for $69.98+ (Available in four colors).