ALTERNATIVE DESK CHAIR: Ball chairs are comfortable and healthy alternatives to traditional work and computer chairs which are often stiff and unforgiving, leading to poor posture and back problems STABILITY BALL SEAT: Sitting on the large, heavy duty inflatable yoga ball helps correct your posture and strengthen your back and core muscles as if you were exercising; a small hand pump is included STRONG PLASTIC FRAME: The balance ball fits snugly inside a 22 x 22 x 31 inch wheeled base made of durable plastic material to withstand daily use; the sturdy frame allows for easy assembly in minutes SCULPTED BACK SECTION: The fitness ball holder has a tall, specially shaped back to provide ergonomic support and improve your spinal alignment, preventing lingering back stiffness and soreness EASY TO TRANSPORT: Use our ball chair to build a healthier core and prevent back pain; the rolling base is compact and lightweight so you can take it to your office, classroom or anywhere in your home