By
eHow Sports & Fitness Editor
Difficulty: Moderately Easy
Step1
Lie down and get comfortable on a floor mat or on a carpeted floor.
Step2
Bend your knees and press your lower back into the floor. Pull your belly button down toward the floor. Your stomach should go in.
Step3
Put your hands behind your neck or on your chest and lift your shoulder blades a few inches off the floor, focusing on your abdominal muscles. Keep your back flat and avoid flopping your knees.
Step4
Exhale as you lift up; inhale as you go back down.
Step5
Look straight forward so that you don't inadvertently move your neck. If you're having problems not moving your neck, put your hands on your chest or extend your arms and hands straight out and then lift up.
Step6
Do 25 to 50 repetitions and then take a few minutes break so you don't strain your muscles or cause sore muscles after your workout. If it's been a while since you've done ab crunches, start with a lower number of repetitions and work your way up over several weeks.