Abstract: A knee and leg orthopedic exercising device is shown for use by a person that is seated in a chair. The device itself is a wide leg rest that may accommodate both legs of the user, although it could be used for one leg at a time. This leg rest has a side profile of an inverted capital T having a vertical shank portion that is supported from a generally perpendicular crown portion. The edge of one end of the crown portion is provided with an elongated roller which is adapted to roll upon a floor surface. The top side of the side of the crown portion which is remote from the roller serves as a footrest, while the side of the shank portion of the leg rest which is remote from the roller serves to support the shank of at least one of the legs of the user. This leg rest is provided with holding straps for holding the shank portion of the leg rest against the underside of the shank portion of the user's leg as the user flexes the leg between a vertical and an inclined, outstretched position.