The fitness aerobis sandbag offers a range of options, from the filling material to the handle type, allowing you to choose according to your preferences. By default, the sandbag is filled with either sand, water, or steel shots, depending on your needs. The stability of the sandbag varies depending on the filling level and the amount of air inside. This instability adds an extra challenge to your workouts, as you need to actively engage your deep muscles to compensate for it during every phase of your exercises. The handles are positioned on one side only, providing you with maximum freedom during fitness routines, without getting in the way of exercises that involve direct contact with the sandbag.