As shown in the following figure, lie on the floor with your back and head flat against the floor to begin the crunches. Bend your knees so that your heels rest on the floor. Cross your arms across your stomach. While keeping your back straight and your butt on the floor, slowly raise your upper body until your shoulders are level with your knees. Try not to curl your upper body toward your knees; instead, imagine that it’s being pulled by a string toward the ceiling. Slowly lower your upper body until your back is flat on the floor. Repeat this exercise 25 times.
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