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CoreBodyweightIsolation — spinal flexion

Plank

Reviewed by Bryan Cortez, MS

Brace, don't sag — once 60 seconds is easy, add load, not minutes.

Rep Sweet Spot
30-60
sec
Sets
2-4
holds
RIR
n/a

Coaching profile

beginner isometric. 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

  • Forearms under the shoulders, body in a straight line, glutes and abs braced.

Execution

  • Hold a rigid line, ribs down and pelvis tucked (no sagging), and breathe. The quality of the brace beats the duration.

Common Errors

  • Hips sagging (the lower back takes the load)
  • Hips piked up too high
  • Holding the breath
  • Chasing minutes instead of bracing hard

Cues That Work

  • Ribs down; squeeze the glutes; breathe behind the brace

No-Fly Zone

multi-minute holds (add load/leverage instead of chasing time)

Programming

Sequence priority

Flexible

Low-fatigue stability hold — a finisher, or first as a bracing primer before heavy lifting.

Progression

Model — Density

Fallback model — Double

Add time to ~60 sec, then add load (a plate on the back) or leverage (long-lever) rather than chasing 5-minute holds.

Best program fit

Full body

Load increments

Standard+10-15 sec, or a plate on the back
Smaller incrementdrop to the knees to scale
Larger incrementlong-lever or weighted plank

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

    Forearm vs high plank; stance width; knees down to scale.

  2. Step 2

    ROM / tempo / bias

    Add a reach or leg lift; long-lever (elbows forward); weighted.

  3. Step 3

    Implement swap

    Ab wheel, dead bug, or stir-the-pot for harder anti-extension.

Substitutions

Approved fallback

Ab wheel, dead bug, or stir-the-pot for harder anti-extension.

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The Evidence

Builds anti-extension core stability and bracing. Does NOT build ab size like loaded flexion — pair with cable crunches.

SFR — 9

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