Abstract: An apparatus for mechanically stimulating a human user includes in one embodiment a base frame, a rigid plate connected to the base frame and having an area sufficient to support a standing human, a vibrational device attached to the bottom of the horizontal plate whereby the plate is caused to oscillate in both vertical and horizontal directions at a desired frequency with an amplitude of less than 2.0 mm, and a frequency control device whereby the frequency of the vertical and horizontal oscillations may be selectively and independently adjusted. Vertically extending handrails are preferably connected to the device such that vibrations may be transmitted to the arms and upper spinal region of a user's body when grasped.