10 Best Crunches Alternatives for Lower-Back Pain

Crunches are done lying on your back. Ranked closest by our scoring: the Crunch - Legs On Exercise Ball. Three harder versions, the Decline Oblique Crunch, the Crunch (Hands Overhead) and the Decline Crunch, are listed below as progressions rather than swaps.

Crunches

Each substitute is scored on movement pattern, muscles worked, equipment and body position. Read how we rank alternatives

How to Do Crunches

The steps for Crunches themselves, so you can judge how close each substitute below really is.

Abdominals · Bodyweight · Beginner · Isolation

  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.

The 10 Best Crunches Alternatives

10 substitutes, ranked by how closely each one matches Crunches on movement pattern, muscles worked, equipment and body position. The higher the score, the less you change. Cards with a "How to perform it" link open to show the steps; every card title links to that exercise's own alternatives page. Harder versions are tagged as progressions and kept out of the top spot even when they score higher.

  1. Crunch - Legs On Exercise Ball

    1. Crunch - Legs On Exercise Ball

    98% match

    Abdominals · Intermediate · Isolation

    A good swap when you have a stability ball to work with, and it still works the abdominals.

    • Stability-ball
    How to perform it
    1. Lie flat on your back with your feet resting on an exercise ball and your knees bent at a 90 degree angle.
    2. Place your feet three to four inches apart and point your toes inward so they touch.
    3. Place your hands lightly on either side of your head keeping your elbows in. Tip: Don't lock your fingers behind your head.
    4. Push the small of your back down in the floor in order to better isolate your abdominal muscles. This will be your starting position.
    5. Begin to roll your shoulders off the floor and continue to push down as hard as you can with your lower back. Your shoulders should come up off the floor only about four inches, and your lower back should remain on the floor. Breathe out as you execute this portion of the movement. Squeeze your abdominals hard at the top of the contraction and hold for a second. Tip: Focus on a slow, controlled movement. Refrain from using momentum at any time.
    6. Slowly go back down to the starting position as you inhale.
    7. Repeat for the recommended amount of repetitions.

    Sets and reps: 3 sets of 10 to 15 reps.

    Why this matches
    • Primary muscle: abdominals, the same as Crunches
    • Equipment: bodyweight only, the same as Crunches
    • Body position: lying on your back, the same as Crunches
  2. Decline Oblique Crunch

    Progression

    2. Decline Oblique Crunch

    86% match

    Abdominals · Intermediate · Isolation

    Pick this when you want a harder version that still works the abdominals.

    • Bodyweight
    How to perform it
    1. Secure your legs at the end of the decline bench and slowly lay down on the bench.
    2. Raise your upper body off the bench until your torso is about 35-45 degrees if measured from the floor.
    3. Put one hand beside your head and the other on your thigh. This will be your starting position.
    4. Raise your upper body slowly from the starting position while turning your torso to the left. Continue crunching up as you exhale until your right elbow touches your left knee. Hold this contracted position for a second. Tip: Focus on keeping your abs tight and keeping the movement slow and controlled.
    5. Lower your body back down slowly to the starting position as you inhale.
    6. After completing one set on the right for the recommended amount of repetitions, switch to your left side. Tip: Focus on really twisting your torso and feeling the contraction when you are in the up position.

    Sets and reps: 3 sets of 8 to 12 reps, and add reps before you add load.

    Why this matches
    • Primary muscle: abdominals, the same as Crunches
    • Equipment: bodyweight only, the same as Crunches
    • Body position: lying on your back, the same as Crunches
  3. Prisoner Half Sit-upPlay demonstration

    3. Prisoner Half Sit-up

    85% match

    Abs · Beginner · Isolation

    A looser match: it uses the same equipment, but it works the abs rather than the abdominals.

    • Bodyweight
    How to perform it
    1. Lie flat on your back with your knees bent and feet flat on the ground.
    2. Place your hands behind your head with your elbows pointing outwards.
    3. Engaging your abs, slowly lift your upper body off the ground, curling forward until your torso is at a 45-degree angle.
    4. Pause for a moment at the top, then slowly lower your upper body back down to the starting position.
    5. Repeat for the desired number of repetitions.

    Sets and reps: 3 sets of 8 to 12 reps, and add reps before you add load.

    Why this matches
    • Primary muscle: abs, not abdominals
    • Equipment: bodyweight only, the same as Crunches
    • Body position: lying on your back, the same as Crunches
  7. Crunch (On Stability Ball)Play demonstration

    7. Crunch (On Stability Ball)

    81% match

    Abs · Intermediate · Isolation

    A looser match: it works the abs rather than the abdominals.

    • Stability-ball
    How to perform it
    1. Sit on the stability ball with your feet flat on the ground and your knees bent at a 90-degree angle.
    2. Lie back on the ball until your lower back is supported and your upper body is parallel to the floor.
    3. Place your hands behind your head or across your chest.
    4. Engage your abs and lift your upper body towards your knees, curling your torso forward.
    5. Pause for a moment at the top of the movement, then slowly lower your upper body back down to the starting position.
    6. Repeat for the desired number of repetitions.

    Sets and reps: 3 sets of 10 to 15 reps.

    Why this matches
    • Primary muscle: abs, not abdominals
    • Equipment: bodyweight only, the same as Crunches
    • Body position: lying on your back, the same as Crunches
    • Balance: harder to stay steady on than Crunches

Why You Might Need a Crunches Alternative

You might substitute crunches because repeated trunk flexion can irritate the lumbar discs, or because neck strain and hip-flexor dominance limit effective abdominal loading. Crunches produce short-range rectus abdominis contraction while recruiting iliopsoas; that combination sometimes reduces true core activation. Alternatives emphasize anti-extension, motor control, or full-range shortening of the abs to lower spinal shear and increase abdominal recruitment. For rehab, pick exercises that allow a neutral spine (cue: ribs-down, pelvis neutral). For strength or hypertrophy, select movements that increase time under tension or add external load while keeping proper breathing and core bracing.

Crunches FAQ

What muscles does Crunches work?

Crunches primarily target the rectus abdominis and engage the external obliques to a lesser degree. Hip flexors (iliopsoas) assist during the movement, and repeated lumbar flexion can increase spinal loading; cue: curl the sternum toward the pelvis while exhaling.

What is the best bodyweight alternative to Crunches?

The plank is the best bodyweight alternative because it trains the rectus abdominis, transverse abdominis, and obliques isometrically without repetitive lumbar flexion. Cue: hold a neutral spine, draw the navel to the spine, and squeeze the glutes to maintain alignment.

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