Allow us to introduce our newest addition: the yoga ball chair! If you are looking for a break from walking on your treadmill and want something to engage your core while sitting, this is just what you need! It engages your core while sitting and it won't damage your treadmill as those rolling chairs do. Whether you use our yoga ball office chair all day or go back and forth from walking on your treadmill desk, it makes the perfect addition to any workstation. The yoga ball is a stylish, fun, and comfortable accessory that has many functions. The soft fabric makes it comfortable to sit on and prevents slipping while you perform exercises like stretching or other fitness activities. The yoga ball chair doesn’t just tone your muscles, it makes strengthening your core comfortable and productive!To use: Simply inflate the yoga ball until it fits in the cover provided. Size variation to fit best for your height: 25” is great for any height under 6’ 30” will suit better for height taller than 6’ Stay active, even when you are sitting, with this perfect alternative to an office chair.