An abdominal exerciser can be used while standing up. The user stands on the anchor base and rests the neckpad on his shoulders while gripping the handlebars. The user can then bend forward and backward to strengthen the abdominal and lower back muscles or side-to-side to strengthen the obliques. The unit is adjustable to fit various sizes of users and/or styles of workouts and can be partially disassembled for easy transportation. The unit comprises an elongate stem/tail assembly, a handlebar assembly including the neckpad to attach at the upper end, and an anchor base to attach at the bottom end. Resistance bands removably attached to hooks between the anchor base and the stem/tail assembly provide variable resistance to the user.