Exercise guide · evidence-graded

Cable Crunch

The cable crunch is a kneeling abdominal exercise: holding a rope attached to a high pulley, you curl your spine down towards your thighs against the cable's resistance. It works the rectus abdominis (the six-pack muscle) with the obliques assisting, and the weight stack makes it easy to add load over time.

Also called: Kneeling Cable Crunch, Rope Crunch, Kneeling Rope Crunch · Equipment: cable · Pattern: isolation

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How to do it

Step by step

Attach a rope to a cable set at the highest position. Kneel facing the stack about an arm's length away, with your knees hip-width apart.
Hold the rope ends beside your head, elbows bent, and keep your hands fixed in that position for the whole set.
Lift your hips so they sit above your knees, with your torso tall and leaning slightly forward and the cable taking up tension.
Breathe out and curl your spine down, bringing your ribcage towards your pelvis and your elbows towards your mid-thighs.
Keep your hips high and still. The movement comes from your spine curling, not from your hips bending.
Hold the fully curled position for a moment with your abs tight.
Uncurl under control back to the tall starting position, letting the cable stretch your abs before the next rep.
After the last rep, uncurl fully, let the rope rise back towards the pulley and let go before you stand up.

Coaching cues

Curl your ribcage towards your pelvis
Hips stay high and still
Hands fixed beside your head
Breathe out as you curl down
Uncurl slowly into the stretch

In VALDA, these cues are one tap away on the exercise while you train.

Muscles worked

What it trains

Muscle	Role	Evidence
Rectus abdominis: upper	Prime mover	B
Rectus abdominis: lower	Secondary	C
Obliques (internal/external)	Secondary	C
Transverse abdominis	Stabiliser	C

Evidence grades: A = strong research base · B = good · C = limited · D = coaching consensus.

Common faults

What goes wrong, and the fix

Sitting back towards the heels

Fix: Keep your hips high above your knees and curl only through your spine.

Pulling with the arms

Fix: Fix your hands beside your head and let them move only as your trunk curls.

Cutting the stretch short

Fix: Uncurl until your torso is tall and your abs are stretched before each rep.

Leading with the head

Fix: Keep your chin slightly tucked and move your head with your trunk.

Letting the stack yank you up

Fix: Take two to three seconds to uncurl back to the tall position.

Programming

What the research says

Muscle growth · first choiceStrengthGeneral fitnessEndurance

Load and reps — Research comparing loads finds muscle growth is similar across a wide range of loads when sets are taken close to failure. Moderate to high reps are common for cable crunches.
Effort — Studies show sets that finish a few reps short of failure capture most of the growth benefit; true failure adds only a small extra effect.
Progression — Research finds adding reps and adding load give similar growth when effort is high. The stack lets you add load in small steps once the top of your rep range is reached.
Volume — Research links more weekly sets for a muscle to more growth, with diminishing returns. Most of that research measured limb muscles rather than the abs.
Range of motion — Research finds full range of motion favours growth in the legs, but no study has yet looked at range of motion for the trunk muscles.

Alternatives · VALDA FLEX

Swap it mid-workout

With VALDA Pro, FLEX offers alternatives like these when you swap an exercise mid-workout.

Log the cable crunch in VALDA, with these cues one tap away while you train and your history for it in one place.

General information about exercise technique, not medical advice. If you have an injury or a health condition, your healthcare provider is the right person to ask.