small, effectively, for young and old

My physiotherapist has advised me after knee surgery this device to strengthen the muscles. For me it's really a good workout to keep the device in balance, and it's not as easy as you might think. It surprised me very much, how many ways you have with so much simplicity. It is always ready to hand (I store it under my TV table). After checking with the Herstseller there is a guarantee for a maximum weight of 120 kg, however it run test for higher weights.