Adidas adjustable ab bench the adidas adjustable ab bench can be adjusted into both flat or decline positions which enable you to adapt the intensity of each exercise and target different muscles in your torso the ankle pad pivots to self adjust to your leg length and under the bench is an integrated rack for safely storing dumbbells between reps the mid section or the core musculature is made up of the muscles that work to stabilise and support your torso for example the rectus abdomini