An abdominal muscle exercise device which facilitates exercising and training of abdominal and lower back muscles while in a standing position. The exercise device has a platform with vertical members at the back of the platform. A horizontal member is attached at the top ends of the vertical members. The vertical members have an angled member extending away from the platform to prevent the platform from tipping during use. The vertical members can be removably and/or foldably connected to the platform and can be adjustable in height. The angled members can be removably and/or foldably connected to the vertical members and can be adjustable in length. The exercise device is constructed so that a user can stand on the platform and bend backwards over the horizontal member to exercise the abdominal and lower back muscles. Exercising these muscles in this standing position minimizes the stress encountered by the spine during abdominal exercising, and concentrates the stress on the abdominal muscles.