Cable Crunch: How to Do It, Muscles Worked and Mistakes

By Alex Lawrence · Updated 4 November 2026

Primary muscles: Abs
Secondary muscles: Obliques
Equipment: Cable

The cable crunch is an ab exercise where you kneel facing a cable machine, hold a rope beside your head, and curl your ribcage down towards your hips against the weight. Because you can add weight in small steps, it’s one of the easiest ab exercises to make progressively harder.

What muscles do cable crunches work?

Cable crunches mainly work your rectus abdominis (the “six-pack” muscle), with your obliques helping. The rectus abdominis runs down the front of your stomach from your lower ribs to your pubic bone, inside a fibrous sheath, and its job is to bend (flex) your spine forward. That’s the movement of a crunch.

Unlike floor crunches, a cable lets you add load the same way you would for a curl or a press. A bodyweight crunch is like a bike stuck in one gear; the cable stack gives you the other gears.

How to do a cable crunch

Kneel facing a high cable with a rope attachment, hold the rope beside your head, and curl your chest down towards your knees by rounding your spine.

Set up. Attach a rope to a high pulley. Kneel about an arm’s length from the stack, facing it. A mat under your knees helps.
Hold the rope. Pull the ends down beside your ears or forehead. Your hands stay there for the whole set.
Start position. Sit your hips back slightly so they’re above your knees, not on your heels. Back long, abs braced.
Crunch. Curl your ribs down towards your hips, rounding your back, until your elbows come towards your thighs.
Pause and return. Squeeze for a second, then uncurl slowly until your back is long again.

Form cues that help

The best cable crunch cue is “ribs to hips”: the movement comes from your spine curling, not from your hips folding.

Hips stay still. If your bum drops towards your heels, your hip flexors and bodyweight are doing the work.
Hands glued to your head. Pulling with your arms turns it into a pulldown.
Breathe out as you crunch. A full exhale helps your abs shorten fully.
Control the way up. Don’t let the stack yank you upright.

It’s like rolling up a yoga mat from the top: the curl starts at your ribs and works down, and the mat doesn’t get shorter by sitting back on its heels.

Common cable crunch mistakes

The most common cable crunch mistake is sitting back onto your heels instead of curling your spine.

Mistake	What it looks like	Fix
Hinging at the hips	Bum sinks back to heels, back stays flat	Keep hips high and still; round your spine
Pulling with the arms	Hands move away from your head	Lock your hands by your ears
Too heavy	Jerky reps, small range	Drop the weight until you can pause at the bottom
Rushing the return	Weight stack slams	Count two seconds on the way up

Sets, reps and weight

For stronger, more visible abs, 3–4 sets of 10–15 reps is a sensible starting point, with a weight that makes the last few reps hard. The ACSM position stand supports progressive overload for every muscle, and your abs are no different.

Add reps, then add a plate. A visible six-pack also depends on body fat, which comes down to diet more than crunches. The calorie deficit guide covers that side.

Cable crunch alternatives

Any exercise that curls your ribcage towards your pelvis against resistance trains the same muscles.

Ab crunch machine: the same movement, seated, with a fixed path.
Weighted crunch: lie on the floor and hold a plate on your chest.
Reverse crunch: curl your hips up towards your ribs instead.
V-up: a bodyweight move that brings your legs and chest together.
Hanging knee raise: curl your knees up while hanging from a bar.

For a full-trunk challenge, add farmer’s carries: your abs and obliques work hard to keep you upright.