Cable Crunch: how to do it right
In short: The cable crunch isolates the abs, in particular the upper rectus abdominis, with a tension peak in the shortened position, body curled.
How to do it, step by step
- 1Set the cable high, grab the rope and bring your hands near your forehead or temples.
- 2Kneeling, back slightly pre-flexed, hips fixed: it's the spine that will curl.
- 3Curl the spine by bringing the sternum toward the pelvis, without pulling with your arms.
- 4Squeeze the abs hard for 1 second in the low position, back well rounded.
- 5Unroll slowly while resisting, without returning into hyperextension.
- 6Keep a controlled rhythm: 1 s of contraction, 2 to 3 s on the return.
The mistake to avoid
Don't pull with your arms or hips. Curl with your abs.
Other common mistakes
- Pulling with the arms and shoulders: keep the elbows fixed and think about curling the trunk, not rowing the rope.
- Folding at the hips without rounding the back: the spine must curl vertebra by vertebra, not the hip.
- Rushing the end of the movement: since the peak is in contraction, make sure to hold the 1 s pause with a rounded back.
- Returning too fast into extension: control the return to keep tension and protect the lower back.
Muscles worked
- Main:
- Abs
The rectus abdominis is the prime mover, especially its upper and middle fibers that bring the sternum toward the pubis. The obliques stabilize the trunk and prevent rotation. The transversus abdominis acts as deep bracing to lock the midsection. The hip flexors stay deliberately little involved if you curl the back rather than folding at the hips.
What to replace it with
Same muscle, same part of the movement: these exercises do the same job.
- Machine Crunch ›
- Sit-Up Throw ›
- Cable Oblique Crunch ›
- Captain's Chair Knee Raise ›
- Weighted Dumbbell Russian Twist ›
Frequently asked questions
How do I do this exercise?
Pulley high, rope in hand near your forehead or temples, kneeling, hips fixed. Curl the spine by bringing the sternum toward the pelvis, without pulling with your arms. Squeeze 1 s with a rounded back at the bottom, then unroll slowly without returning into hyperextension.
How far down should I go?
The max tension is when your back is fully curled, abs crushed. Look for the crunch peak, squeeze 1 s at the end of the range. Curl all the way but without wriggling or pulling with the arms, and never return into hyperextension on the way back.
How fast do I do the movement?
1 s of curling with a tight peak at the bottom, then 2 to 3 s of braked return. Never let go all at once: it's the control of the unrolling that keeps the tension on the abs.
How do I breathe?
Exhale hard as you curl, it helps the rectus abdominis contract and empties the abdomen. Short breath hold at the top during the 1 s pause to lock the bracing. Inhale gradually during the return, transversus engaged throughout.
Do I need to warm up first?
One light set with no weight to find the curling movement is enough if it's your first ab exercise. If it comes after a big movement, your abs have already braced, you can go straight in.