This 65 cm diameter Avento gym ball is ideal for sitting, back exercises and general fitness. You can also increase your torso stability and do some aerobic and physical therapy exercises. This ball is increasingly being used as a substitute for (office) chairs to give the user a better sitting posture. The ball is suitable for users with a height of 165 to 185 cm and a body weight of up to 100 kg. anti-burst (explosion protection) antistatic surface diameter 65 cm suitable for a user of height. 165 to 185 cm and a body weight of up to 100 kg weighing 1100 grams.