This is a variation of the most popular abs exercise. The machine helps to work the abs in isolation.
Stand on your knees with your back facing the bars.
Grasp the handle and bring it over your head.
Place your feet under the pads.
As you exhale, twist your torso slowly.
Pause for 1-2 seconds at the top and, as you exhale, slowly return to the starting position.
Avoid using a heavy weight, in order not to take the load off the target muscles and not to lose concentration.
Don't push the handle down, do the exercise slowly.