A spinal-length mattress including a means for providing buoyancy to a human torso and abdomen thereon; attached to the mattress at one end, a pelvic support portion; and attached to the mattress at an opposite end, a head rotation stabilization portion having an air passage opening allowing a person to breathe freely when resting in a face down position thereon. By supporting the pelvis and stabilizing the head to substantially limit motions of the neck, a central cushion (preferably dominated by a “shape memory foam” filling) allows the spinal column to passively distribute all directional stresses—including those deriving from body mass and from muscle tension. Thus relieved of stress, disks between spinal bones begin to return to their respective naturally compliant symmetrical shapes; thereby generally providing a long term benefit in exchange for a quarter hour or a half hour of regular prone-oriented engagement with the mattress.