Butterfly Crunch Lie on your back with your knees open and the soles of your feet together (in a butterfly position). Lengthen your arms overhead so they are resting on the floor. Exhale and bring your hands and knees toward each other, performing a full-body crunch. Your shoulder blades should be off the mat as you perform a small reverse crunch, lifting your pelvis a bit off the mat. Hold this position for a moment and really feel your abs squeezing. Slowly lower your arms and feet back to starting position to complete one rep. Do as many crunches as you can in one minute. Image Source: POPSUGAR Photography