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Step 1
Place the Ab Chair on a solid surface, preferably a wooden or stone floor. Carpeted floors might make the Chair wobbly and thereby less effective.
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Step 2
Sit down on the Ab Chair and place your feet on the two adjustable metal footrests. Grip the handles on both sides with your hands to help you make the "crunch" motion. Alternatively, you can place your hands over your head and grab the strap at the top of the machine for support.
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Step 3
Once you are seated comfortably, begin moving your upper body forward while simultaneously moving your lower body toward your upper body. This motion is called the "jackknife." It is a standard crunch motion meant to work out both lower and upper abdominal muscles. As you do this, notice that both the top and bottom of the machine move with your body, supporting you as you tone your abs. Start with about 25 reps, then increase as you feel more comfortable using the Ab Chair.
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Step 4
To work your obliques (the muscles on the sides of your midsection), sit down on the Ab Chair as you did in Step 2 and twist your upper body slightly to the right while your lower body remains in its original position. As you did in Step 3, move your upper body forward and your lower body toward your upper body. Do about 25 reps then switch sides.
