Roller ski for training long distance skiing

A roller ski for training skiers of the type having a foot plate with binding means adapted to retain the user's ski shoe in such a manner that the heel portion is freely pivotable about the firmly fixed toe portion, and which foot plate has rotatably mounted thereon a forward and a rear wheel, comprising supporting members arranged to extend upwards from the foot plate to form side supports for the user's lower legs, said supporting members being rigid side members which extend on each side of the foot plate in arc-form upwards from the foot plate between its forward and rear portions for providing, during the pivoting of the heel portion around the binding means, lateral supports at a level just above the ski shoe, along the entire motion path of the lower leg, without thereby holding or hampering the leg in its motion in the longitudinal direction of the roller ski.