Exercise library · Abs

How to Do Crunches

Step-by-step instructions, muscles worked and workouts that use the crunches.

How to do it

1. Lie flat on your back with your feet flat on the ground, or resting on a bench with your knees bent at a 90 degree angle. If you are resting your feet on a bench, place them three to four inches apart and point your toes inward so they touch.
2. Now place your hands lightly on either side of your head keeping your elbows in. Tip: Don't lock your fingers behind your head.
3. While pushing the small of your back down in the floor to better isolate your abdominal muscles, begin to roll your shoulders off the floor.
4. Continue to push down as hard as you can with your lower back as you contract your abdominals and exhale. Your shoulders should come up off the floor only about four inches, and your lower back should remain on the floor. At the top of the movement, contract your abdominals hard and keep the contraction for a second. Tip: Focus on slow, controlled movement - don't cheat yourself by using momentum.
5. After the one second contraction, begin to come down slowly again to the starting position as you inhale.
6. Repeat for the recommended amount of repetitions.

Form tips

• Start light and own the movement before adding weight.
• Control the lowering phase — don't drop into it.
• Keep breathing; exhale on the hardest part.
• Stop if you feel sharp pain (different from muscle burn).

Workouts with this exercise

Similar exercises

Reverse CrunchAbs

Dead BugAbs

Russian TwistAbs

Flat Bench Lying Leg RaiseAbs

Hanging Leg RaiseAbs

Air BikeAbs

Gear for this exercise

Exercise matGrip and comfort for floor work, core and stretching.See it on Amazon →Doorway pull-up barThe cheapest way to train your back and biceps at home.See it on Amazon →

Exercise photos and instructions: free-exercise-db (public domain). Animation made from the real start and end photos.