Too much sitting, too little movement – this sums up the workday of most Germans. The consequences are predictable: many people regularly suffer from back problems, tension, and resulting headaches. However, you can wonderfully train against this with a gym ball. It is ideally suited to strengthen your back and abdominal muscles. At Gorilla Sports, you can find colorful balls in three sizes and six colors. The delivery of the gym balls includes a pump for inflation. A fitness or gym ball with a diameter of 55 cm is a smaller version of this practical and versatile sports equipment. This size is best suited for individuals with a height of up to 160 cm. Taller athletes can also use these balls, but not all exercises can be performed with a ball of this size. The choice of color is a matter of taste, although it makes sense to acquire different sizes in various colors.