This great product is just like a swiss ball, but it has 6 'legs' to stop it from rolling away. Use the PhysioRoom.com Faster Blaster Dual Action Pump to inflate the Gymnic Home & Office Anti Burst Swiss Ball. Then simply place the legs downwards on the floor and sit on the ball. The slightly unstable base improves your posture, prevents slouching and stops prolonged stress on the structures of the lower back. The ball is burst resistant quality. Even if damaged with knives, or other pointed objects there is no danger of sudden lack of pressure.