Selectorized Seated Ab Crunch
Reviewed by Bryan Cortez, MS
Anchor the pelvis and make the ribs move toward it—do not pull the machine with the arms.
Demonstration
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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
Setup
- Adjust the seat and foot support so the pelvis is anchored
- Place the torso pad across the upper chest or shoulders as designed
- Hold the handles without pulling them down
- Begin tall with the stack under light tension
Execution
- Bring the ribs toward the pelvis through controlled trunk flexion
- Keep the hips and pelvis planted
- Pause briefly in the shortened position
- Return until the abdominals lengthen without the stack resting
Common Errors
- Folding mainly at the hips
- Pulling the handles with the arms
- Rocking the pelvis
- Letting the stack crash between reps
Cues That Work
- Ribs toward belt; pelvis stays planted; arms only hold the machine
No-Fly Zone
Avoid pulling with the arms, driving from the hips, forcing painful spinal flexion, or using a pad that loads the neck.
Programming
Sequence priority
Late
Direct trunk flexion belongs after bracing-dependent compounds so local abdominal fatigue does not reduce stability on earlier lifts.
Progression
Model — Double
Fallback model — Double
Keep seat, pad, pelvis contact, and spinal range fixed; reach the top of the rep range before adding one selector step.
Best program fit
Full body
Load increments
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
Setup tweaks
Lower the load and adjust the seat until trunk flexion can occur without hip rocking or neck pressure.
Step 2
ROM / tempo / bias
Add a one-second shortened pause or a slower return before increasing the selector load.
Step 3
Implement swap
Kneeling cable crunch, stability-ball crunch, or floor crunch with external load.
Substitutions
Approved fallback
Kneeling cable crunch, stability-ball crunch, or floor crunch with external load.
The Evidence
The machine makes trunk flexion stable and measurable, but its value depends on axis and pad fit. The S theory tier does not prove it outperforms cable or floor crunches.
SFR — 4.5
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