Isokinetics Inc. brand is sold ONLY by Isokinetics Inc. Beware of imitators. Please search YouTube (“isokinetics inc”) for our instruction videos, especially for proper ball inflation. We provide our brand with a 1 year guarantee, administered directly by Isokinetics Inc. in Arkansas, USA. For many people, sitting on an exercise ball while at home or work promotes flexibility, coordination, motor skills, core strengthening, and balance. Your body, when positioned on top of an exercise ball, is constantly making small adjustments, often imperceptible, to remain balanced and thus is constantly exercising a large group of muscles in doing so. By strengthening your body’s core muscle group you help improve your posture, have better balance and guard against back injuries. Many people who have tried a ball chair simply prefer it to traditional chairs. It may take time before your body becomes accustom to sitting on an exercise ball. You may need to try different ball pressures until you find the level you prefer. Start by using it 10 to 15 minutes a day and gradually work your way up. If you have had back problems or injuries, make sure to consult your physician or therapist first. Note: We provide a small, starter pump for free for you to have a way to inflate your ball. However, exercise balls require a lot of air and it will take a lot of pumping with the free pump. So, you may want to consider purchasing at this time a high volume air pump, especially if you use exercise balls a lot or have other things you often inflate, like pool toys or air mattresses. Please follow ball inflation instructions carefully. All exercise ball need time to stretch. We guarantee our exercise ball will inflate to its intended size (52cm).