The device has a wheel (1) positioned between two side plates to which an axle (3) of the wheel is fixed. The foot plates (9) positioned under the wheel are connected to the side plates (7) and extend outwards. The side plates extend above a knee (21) of a person standing on either one or both of the foot plates during normal use of the device. An independent claim is also included for an auxiliary device for the reduction of the friction between the knees of the person using the device.
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