Reviewed by Bryan Cortez, MS
Round the spine toward the pelvis — abs flex the spine, they don't hinge the hips.
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.
How the rankings are built →Demonstration
Demonstration production queue
Physique Skool is filming one canonical demonstration per exercise. Until this movement is published, use the setup, execution, common errors, programming, and substitutions below.
Browse Physique Skool on YouTubeHow to do it
No-Fly Zone
under 5 reps (becomes a hip hinge / pulldown with the abs static)
Programming
Late
Loadable core isolation — a finisher; the one ab move you can run real progression on.
Model — Double
Fallback model — Triple
Double progression: 8→15, then a pin (or micro-plate) and reset.
Full body
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.
Step 1
Rope vs bar; hand position; hip angle (more back = stricter flexion).
Step 2
Pause at the crunch; slow eccentric; full stretch at the top.
Step 3
Machine crunch, weighted decline sit-up, or reverse crunch.
Substitutions
Machine crunch, weighted decline sit-up, or reverse crunch.
Compare all core optionsThe Evidence
Progressively overloads spinal flexion. Does NOT train anti-extension or rotation — add planks/oblique work.
SFR — 4
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