Abstract: A device to assist an exerciser in performing an abdominal exercise includes two rigid elements, a rigid cross member with a first end that is coupled to a first of the two rigid elements and a second end that is coupled to a second of the two rigid elements, and a soft material that defines a first surface coupled to a lower surface of the rigid cross member. Each rigid element is configured to define: a first portion that extends from a first end of the rigid element to a first bend, a second portion that extends from the first bend to a second bend that bends in a direction that is opposite the first bend, and a third portion that extends from the second bend to a second end of the rigid element. The first, second and third portions of the rigid element are substantially flat.

Abstract: An exercise device includes a flat base having a first end and an opposing second end. The base is configured to engage a flat exercise surface. The exercise device further includes a pair of opposing sidewalls extending away from the base and an arcuate upper surface extending between the first end and the second end between the pair of opposing sidewalls. A first angle is defined between the base and the upper surface proximate the first end and a second angle is defined between the base and the upper surface proximate the second end. The exercise device also includes a coccyx cutout in the upper surface proximate at least one of the first end and the second end.

Abstract: A method and an exercise device for exercising the upper and the lower abdominal muscles and the lower back of a user are provided. The exercise device includes a first portion and at least one of a first extension hingedly coupled to a first end of the first portion and a second extension hingedly coupled to a second opposite end of the first portion, each of the first and second extensions including a flat bottom wall, a top surface, a pair of opposing side walls, and a resilient material extending between the bottom wall and the top surface.