Max. user weight
The maximum mass that the shell of a gymnastic ball is able to withstand. The maximum user weight is closely related to the maximum load on the inflatable bladder. In the process of jumping and swinging, a user weighing 100 kg can create almost twice as much load on the fitball, for this reason, in parallel with the weight limit, manufacturers of gymnastic balls often indicate the value of the maximum load.
Diameter
The diameter of the fitball largely determines the age category of users. Gymnastic balls for adults have a diameter of 50-80 cm, while for children — about 30-50 cm.
Regarding medicine balls, the diameter of the vast majority of balls is in the range of 20-35 cm. Some manufacturers of medicine balls tie the diameter to the mass. With an increase in the weight of a sports equipment, the diameter may also increase. Additionally, the girth of the medicine ball may depend on the specific purpose of the ball. Projectiles for throws, bench press and weighting during warm-up often differ from each other in diameter.
