Enhance your Wonder Core 2 workout with the Advanced Upper Body Station attachment, doubling the resistance of the original upper body station from 4.5kg to 9kg to boost your gains. Double the resistance of the original upper body station. Simply attach to your Wonder Core 2 and get ready for an even more effective workout. Improve your strength, fitness and muscle tone even further. As your strength and fitness increases, Wonder Core 2 grows with you to help you keep improving. This product is covered by our 30 Day Money Back Guarantee (Terms & Conditions Apply).