In order to get a good abs workout, you have to enable your abdominal muscles to fully extend and contract during the exercise. When your lay with your back flat on the ground during situps you limit the range of motion of your abdominal muscles. The RAGE Core Mat helps arch your lower back and allows you to increase your range of motion. This mat is also great for crunches with a medicine ball. Fringe benefit: the padding makes crunches more comfortable on your lumber spine (lower back).
Place the thicker part of the mat under your lower back so your upper back extends over the thinner part of the mat (you should see the Rage logo upside down).
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