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CoreCableIsolation — spinal flexion

Cable Crunch

Reviewed by Bryan Cortez, MS

Round the spine toward the pelvis — abs flex the spine, they don't hinge the hips.

Rep Sweet Spot
8-15
Sets
2-4
sets
RIR
0-1

Coaching profile

loadable ab default. This page is the practical coaching layer: use it for setup, cues, programming, pain-free adjustments, and substitutions. The complete biomechanics tier list lives on the muscle page.

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Demonstration

Demonstration production queue

The written coaching card is ready. The owned video is next.

Physique Skool is filming one canonical demonstration per exercise. Until this movement is published, use the setup, execution, common errors, programming, and substitutions below.

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How to do it

Setup

  • Kneel facing a high cable with a rope, hands at the head/neck, hips back.

Execution

  • Crunch by rounding the spine toward the pelvis (the rope follows the head), squeeze the abs, control back up; flex the spine, don't just hinge at the hips.

Common Errors

  • Hinging at the hips instead of flexing the spine
  • Pulling with the arms/lats
  • Not rounding toward the pelvis
  • Coming up too high and losing ab tension

Cues That Work

  • Bring the ribs toward the pelvis; let the spine curl; keep the hips quiet

No-Fly Zone

under 5 reps (becomes a hip hinge / pulldown with the abs static)

Programming

Sequence priority

Late

Loadable core isolation — a finisher; the one ab move you can run real progression on.

Progression

Model — Double

Fallback model — Triple

Double progression: 8→15, then a pin (or micro-plate) and reset.

Best program fit

Full body

Load increments

Standardone pin
Smaller incrementmicro-plate on the stack, not a full pin
Larger incrementone pin once strong

If it hurts

Pain is information, not a challenge to push through. Stop the set if pain is sharp, worsening, or changes how you move. These are exercise-selection options, not medical diagnosis or rehabilitation advice.

Work down this list in order. Stop at the first change that removes the pain.

  1. Step 1

    Setup tweaks

    Rope vs bar; hand position; hip angle (more back = stricter flexion).

  2. Step 2

    ROM / tempo / bias

    Pause at the crunch; slow eccentric; full stretch at the top.

  3. Step 3

    Implement swap

    Machine crunch, weighted decline sit-up, or reverse crunch.

Substitutions

Approved fallback

Machine crunch, weighted decline sit-up, or reverse crunch.

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The Evidence

Progressively overloads spinal flexion. Does NOT train anti-extension or rotation — add planks/oblique work.

SFR — 4

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