Using weight balls during your workout is an excellent way to strengthen and tone upper body muscles while you bounce. However, it's important to remember that rebounding affects the way you experience gravity.
A hand weight of 1kg will feel weightless at the peak of a bounce but can feel as though it weighs as much as 3kgs at the bottom of a bounce due to the gravitational changes. Because of this, it's best to choose lighter weights and let gravity do the rest. Using just 0,5kg weights will boost your workouts and give your arms and upper body muscles an extra challenge.