Therapeutic exercise apparatus

An apparatus for use by a person to perform exercise essentially consisting of:

• a elongated supporting body having an upper surface, a first end region, second end region and a lower surface adapted to contact a stationary supporting surface, said supporting body formed from a flexible, resilient material having substantial firmness to effectively support and position the person's body while performing side sit-up exercises;
• the upper surface comprising an inward concave surface region having a first end and a second end and a predetermined minimum vertical height from the supporting surface substantially centrally located, and having a sufficient length and curvature adapted for supporting the buttocks and for positioning the pelvic girdle at a predetermined starting angle in the range of 40 to 45 degrees from a vertical plane perpendicular to the inward concave surface region at the minimum vertical height for starting the exercise and for allowing the pelvic girdle to rotate from the starting angle through a predetermined angular range to an angle in the range of 65 to 75 degrees from the vertical plane during exercise;
• said inward concave surface region centrally located and extending along the longitudinal axis between said first and second end regions;
• said supporting body further including a first and second outward convex surface regions integral with and continuously attached to said first and second ends of the inward concave surface region, respectively, said first and second outward convex surface regions each having a maximum vertical height from the supporting surface being higher than said minimum vertical height of the inward concave surface region, said first and second outward convex surface regions forming said first and second end regions, respectively;
• said first outward convex surface region having a length along the longitudinal axis adapted to correspond to the length of the person's lower torso region and having an upper surface including an inward concave groove centrally located along and extending laterally about the longitudinal axis, said groove is sized and configured to accommodate the iliac crest of the person thereby providing proper support and positioning of the pelvic girdle during the exercise and allowing the pelvic girdle to rotate from the starting angle through the predetermined range during the side sit-up exercise.