How to Do Cable Crunches: Form, Muscles Worked, and Progression

Quick answer: To do a cable crunch, kneel facing a high pulley with a rope held beside your head, lock your hips in place, and curl your ribs down towards your pelvis until your elbows reach your thighs. Return slowly over two to three seconds. The cable crunch trains the rectus abdominis and obliques, and you progress it by adding weight.

A lot of cable crunches are really a hip hinge with a rope.

The lifter bows towards the floor, the stack goes up and down, and the abs barely shorten. The note says "cable crunch 50kg 15", next week it says 55kg, and that looks like progress when it is mostly more hinge. One cue at the hips fixes the movement, and a log that records your setup makes the numbers mean something.

What muscles does the cable crunch work?

A cable crunch is a loaded ab exercise where you kneel under a high pulley and curl your spine forward against the cable's resistance.

The rectus abdominis does most of the work. It runs from your ribs to your pubic bone and its job is to flex your spine. A cable crunch is spinal flexion against a load, so this is the muscle it targets.

The obliques assist. The internal and external obliques help flex the trunk and stop it twisting as you pull. Curling slightly towards one hip on each rep shifts more work onto them.

The hip flexors should stay quiet. If your hips move, the iliopsoas and rectus femoris take over and your abs barely change length. Keep your hips fixed above your knees for the whole set.

Your arms only hold the rope. If your arms start pulling, the lats and triceps share the load and the abs get less of it.

Crunches lean towards the upper abs. Gomirato and Grenier in the International Journal of Exercise Science used ultrasound on 15 young adults and found crunches produced the biggest thickness change in the upper segment of the rectus abdominis, while leg raises favoured the lower segment. Our guide to how to train abs covers what that means for a full routine.

How do you do a cable crunch with good form?

1. Set the pulley at the top and attach a rope. A straight bar works, but the rope lets your hands sit beside your head.
2. Kneel one to two feet back from the stack. Hold the rope ends next to your temples, thumbs pointing back.
3. Sit your hips high and lock them. Your thighs stay roughly upright with your hips over your knees, and they stay there for the rest of the set.
4. Curl your spine. Exhale and round forward, pulling your ribs towards your pelvis. Your head and hands travel with your torso until your elbows reach mid-thigh.
5. Pause for one second, then return slowly. Uncurl over two to three seconds until your abs are stretched and the weight hovers just above the stack.

Think "ribs to hips". If you picture bringing your head to the floor, you will hinge. If you picture closing the gap between your bottom ribs and your belt line, you will crunch.

Kneeling or standing cable crunch?

Kneeling is the default. Kneeling fixes your pelvis, so it is easier to keep the hips out of it and let the rectus abdominis do the flexing.

Standing works if your knees complain. Crunch down from a high pulley with your hips locked. It needs more balance and it is easier to cheat by sitting back, so start lighter.

What are the most common cable crunch mistakes?

Hinging at the hips. Your hips sink back towards your heels as the weight comes down, and your bodyweight does the work. Keep your hips stacked over your knees.

Pulling with the arms. If your hands drift away from your head, the rope turns into a pulldown. Pin your hands near your temples and let your torso move them.

Too much weight. If the stack is near maxed out and your spine barely rounds, take weight off. A load you cannot curl against turns every rep into a bow.

Letting the stack yank you back up. The lowering half stretches the abs under load. Take two to three seconds on every rep.

Short range. Stopping a quarter of the way down, or never letting your spine extend at the top, cuts the set in half.

How many sets and reps should you do?

Two to four sets of 10 to 15 reps, two or three times a week, suits most lifters. Pick a weight that leaves you one or two reps short of failure with clean form, and count those sets towards your weekly ab volume alongside any leg raises or rollouts.

Use the stack to progress. Load is what a cable crunch has over a floor crunch. Once you can do three clean sets of 15, add the smallest plate the stack allows and drop back to 10 to 12 reps. Progressive overload works on abs the same way it works on a squat.

Heavier loads produced more ab activity. Moraes and colleagues in Physical Therapy in Sport had 13 subjects perform loaded crunches at 20, 40, 60, 80 and 100 percent of their one-rep max. Abdominal activation rose significantly with load and peaked at 100 percent, although adjacent loads such as 20 and 40 percent often did not differ. The authors suggested load jumps larger than 20 percent of the max when the goal is ab strength.

Slow it down before you add weight. A three second lowering or a one second squeeze at the bottom makes the same load harder.

What are the best cable crunch alternatives?

Machine crunch. A seated ab crunch machine does the same job on a fixed path, which helps when the cable station is busy.

Weighted decline crunch. A plate held on your chest gives you loaded spinal flexion with no cable.

Hanging leg raise. It trains the abs from the other end, pelvis to ribs. Our hanging leg raise guide covers the pelvic curl that makes it work, and pairing it with a cable crunch covers both directions.

Ab wheel rollout. It loads the abs in a stretched position and makes a good third exercise.

How should you log cable crunches?

"Cable crunch 40kg 3x15" leaves out which machine you used and how you set it up.

Cable stacks differ between gyms. Pulley ratios vary, so 40kg on one stack can feel very different on another. Our guide to logging machine weights covers how to keep those numbers comparable.

Write the setup next to the load. Note the attachment, kneeling or standing, and the gym if you train at more than one. Then a jump from 40 to 45kg means you got stronger, not that you found a lighter stack.

A four-week cable crunch starting plan

1. Week one: find a clean weight. Pick a load you can curl for 12 strict reps with your hips locked. Do three sets and write down the weight, the attachment and whether you knelt or stood.
2. Week two: own the range. Same weight. Elbows to mid-thigh at the bottom, a full stretch at the top, and a one second pause at the bottom of every rep.
3. Week three: slow the return. Three seconds back up on every rep. Take each set to one or two reps short of failure and note where it landed.
4. Week four: add reps or add weight. If three sets of 15 felt clean, move up one plate and drop back to 10 to 12 reps. If not, repeat week three.

Where Gym Note Plus fits

If you already type your sets into your phone's notes app, keep doing it. Just add the setup to each line.

Gym Note Plus reads plain text the way you already write it and turns it into tracked sets.

• Type cable crunch rope kneeling 40kg 15,14,12 and it becomes structured, charted sets.
• Your setup stays with each session because it is in the text you typed.
• Cable crunch load trends sit next to your other lifts, so you do not need a separate ab tracker.
• Old notes import, so the ab work you have already written down still counts.

Paste a recent session into the free notes to workout translator to see what your shorthand turns into.

A cable crunch only counts when your ribs move towards your hips, and the weight only means something if you write down how you set it up.

Frequently Asked Questions

What muscles do cable crunches work?

Cable crunches mainly work the rectus abdominis, the muscle that flexes the spine, with the internal and external obliques assisting. An ultrasound study by Gomirato and Grenier found crunches produced the largest thickness change in the upper rectus abdominis. The hip flexors should stay quiet as long as your hips do not move.

Are cable crunches better than regular crunches?

Cable crunches are easier to progress than floor crunches because you can add weight in small steps on the stack, while a floor crunch soon turns into high-rep endurance work. Moraes and colleagues found abdominal activation rose significantly with heavier crunch loads, which is the main argument for loading them.

How heavy should cable crunches be?

A cable crunch weight is right when you can do 10 to 15 strict reps with your hips locked and your spine fully curling. If you have to sit back on your heels or pull with your arms to move the stack, the weight is too heavy. Add weight only after three clean sets of 15.

Why do I feel cable crunches in my hip flexors or arms?

Feeling cable crunches in your hip flexors means your hips are moving and the rep has become a hinge. Feeling them in your arms means you are pulling the rope down. Keep your hips stacked over your knees, pin your hands beside your head, and think about bringing your ribs to your hips.

Should cable crunches be done kneeling or standing?

The kneeling cable crunch is the standard version, because kneeling fixes the pelvis and makes it easier to isolate the abs. The standing cable crunch suits lifters with sore knees but needs more balance and is easier to cheat. Log which version you did so your numbers stay comparable.

Final Takeaways

• Curl, do not hinge. Keep your hips over your knees and pull your ribs towards your pelvis.
• Keep the rope beside your head. Your torso moves your hands, not your arms.
• Progress the stack. Abdominal activity rose with heavier loads in the Moraes study, so add weight once three sets of 15 are clean.
• Control the way back up. Two to three seconds on the return keeps the abs working through the stretch.
• Log the setup with the weight. Attachment, kneeling or standing, and gym, or next month's number will not tell you much.