Simple crunch that can be done anywhere.
Lying with your back on the floor or a mat, place your hands behind your head or folded across your chest Bend your knees to 90 degrees and keep your feet flat on the floor.
Lift your shoulder blades off the floor towards your knees, focusing on pulling up with your abs, not your hands. Like all ab exercises, exhale while doing the work (in this case, pulling your body up to your knees)
Inhale, and slowly lower yourself back to the floor.
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