An ADJUSTABLE ABDOMINAL BENCH is a critical component of any strength-building exercise regimen. Especially with some of the innovative discoveries in core strength training, the benefits of having an ab bench go far beyond just simple abdominal toning , ADJUSTABLE ABDOMINAL BENCH is a critical component of any strength-building exercise regimen. Especially with some of the innovative discoveries in core strength training, the benefits of having an ab bench go far beyond just simple abdominal toning.