A cushioning posterior fulcrum back shaper is an apparatus that supports and guides the back and neck of a user. The apparatus encourages the proper form throughout stretches and exercises, positioning each engaged body parts. The apparatus includes a back shaper that supports the arch of the back, and a neck shaper which supports the spine of the user, and consequently the neck. The first grooved channel positions and guides the spine. The back shaper includes a semicircular prismatic body, a sacrum- supporting depression, and a pelvis-supporting depression. The neck shaper includes an elongated body, a first interlocking arm, and a second interlocking arm. The semicircular prismatic body supports the arch of the back. The sacrum-supporting depression and the pelvis-supporting depression position the sacrum and the sacrum and head, respectively. The elongated body is rotatably mounted to the semicircular prismatic body with the first interlocking arm and the second interlocking arm.