Abstract: A portable exercise device for exercising the abdominal muscles is disclosed. The device includes a wheel and a handle. The handle is formed from two handle parts that are releasably attachable to one another to form a bearing surface upon which the wheel is mounted. Various forms of attachment mechanisms are disclosed which lock the device into an exercise position and bear the load on the device when used for exercising. The portable exercise device provides a strong, lightweight, easy to use device that can be broken down into three component parts for storage and transportation and easily assembled to provide a device for exercising the abdominal muscles.