A spinal harness apparatus including a strapping system and a rigid member that is worn by a user during activity. An anterior surface of the rigid member is effectively linear and planar. The anterior surface may make contact with a dorsum of the user at approximate levels of an external occipital protuberance of the user, spinous processes of mid-thoracic vertebrae of the user, and a median sacral crest of the user. The rigid member may be tubular and comprise an inner and outer component with which a total length of the rigid member may be telescopically adjustable while maintaining a linear and planar contact surface. The strapping system may comprise an adjustable belt and suspenders. The strapping system is to be adjustably affixed to the rigid member as well as worn about a torso of the user.