The weight limit of a fitness ball is not just based on the weight of the user but anything they might be holding. If you plan on incorporating weights into your fitness ball workout, this should be added to your own when determining if the weight limit is appropriate for your needs. The maximum weight limit of a fitness ball may also be an indicator of its overall strength as the material will have to be thicker and more durable. All of the balls in our review have a very high weight limit.