The waist-twisting exercise can train the abdominal muscles inside the abs and the hips, as well as the back muscles, which are naturally used to balance during the exercise. Incorporate arm movements with twisting motions for an even better workout. 8 magnets attached to the core twist provide magnetic therapy, which is known is to have a natural healing effect and helps promote blood circulation. The massage knobs work to target reflexology trigger points in the feet while helping to keep you fromslippingfooting Buy a Figure Trimmer and compare it to other abdominal exercise machines. Other cheap stomach exercise equipment uses fewer bearings and the plastic of the board is thinner and does not rotate as smoothly.