A lower limb bouncing device causes knee bouncing by stimulating the hip joint, or base end of a lower limb, while allowing the lower leg, or terminal end of the lower limb, to relax. The device includes: a flap and a motor coupled to the flap. The flap allows a heel resting surface to swing from the motor. The motor includes: an output axis with an eccentric cam; and a pivotable plate on the eccentric cam. The pivotable plate has an attached pivoting end. The flap is on an enclosure side so that the heel can be placed at a minimum height above the floor when the foot is placed on the floor surface. The flap connects to another end of the pivotable plate allowing swing movement by the pivotable plate pivoting around the attached end in response to rotation of the eccentric cam.