The Half-Ball Dynamic is an ideal fitness device for everyday already keeping you moving whilst sitting, and on top of this, is superbly suitable for training core and stomach muscles, as well as is relaxing. The high instability while seated activates deeper tissue. Through the shape and especially its height (ca. 16cm), the vertebrae and waist are supported during training and the movement angle is increased. It is ideal for stretching vertebrae and chest muscles. Content: 1 Half Ball (diameter ca. 40cm), 1 mini pump, 1 exercise instruction manual. Material: PVC (phthalate free). Maximal load capacity: 120kg.