Put your arms behind your head and keep your elbows pressed back, then curl your torso upward, being sure your lower back stays against the mat the whole time. Tilt your torso so your lower back stays pressed into the mat as well. Curl Up: Lie flat on a mat with your knees bent and your heels pressed into the mat to stabilize your body.X Research source Check out some crunch variations below, and incorporate them into your exercise routine. There may never be agreement among trainers as to whether or not crunches are the best way to flatten your abs, but there's no disputing the fact that they work the muscles on the front and side of your abdomen.
Do crunches to strengthen your abdominal muscles.
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