A gym ball is a fantastic training tool and is available in almost all gyms and training facilities. The name pilates ball (which is the most common name) comes from the form of exercise Pilates, which is about performing harmonious and controlled exercises that stabilize and strengthen both body and psyche.

The most common exercises you usually do with an exercise ball are so-called trunk exercises/core exercises which strengthens the stomach, hips and lower back. By "core" one simply means the core of the body and it is important for one's overall well-being and functionality to have a strong core.

One of the biggest advantages and subtleties of an exercise ball is that it constitutes a so-called unstable ground. This means that when you exercise on your gym ball, your body must constantly keep the balance (hence why they are sometimes called just balance ball). The consequence is that lots of small muscles and joints are activated and the body as a whole becomes more stable and stronger.