Abstract: A wheelchair exercise device comprising two assemblies, each assembly comprises: a seat plate; a longish pipe element; and a wide belt. The seat plate is L-shaped and made of hard material, the longish pipe element is flexible and has padding on its top side, the longish pipe element mounted onto ferrule or hole integrated approximately in the middle of the vertical edge of the L-shaped seat plate, the first end of the wide belt is attached to the longish pipe element and adjustable upwards, downwards and around the pipe of the longish pipe element, and the second end of the wide belt has hook and loop fastener. The two assemblies are adapted to be fastened onto each other by the hook and loop fasteners, and the assemblies are designed so that the combined measurement of both the width and length of the seat plates is smaller than the measurement of a wheelchair seat, thereby allowing the width and vertical adjustment of the location of the seat plates on the wheelchair seat.