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LegsPin machineIsolation — knee flexion

Lying Leg Curl

Reviewed by Bryan Cortez, MS

The hamstring bends the knee too — curls cover what hinges can't.

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

Coaching profile

simple machine curl. 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

  • Face down, knee just off the pad edge, pad on the lower calf, hips pinned.

Execution

  • Curl the heels toward the glutes, squeeze, control down; keep the hips pressed into the pad.

Common Errors

  • Hips lifting off the pad to cheat
  • Jerking the weight up and dropping it down
  • Partial reps with no full stretch
  • Going so heavy the form collapses

Cues That Work

  • Press the hips into the pad; pull the heels toward the glutes; lower without dropping the stack

No-Fly Zone

under 5 reps (heavy partials cramp more than they build)

Programming

Sequence priority

Late

Single-joint, low fatigue — late as a hamstring finisher, or early as a pre-exhaust.

Progression

Model — Double

Fallback model — Triple

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

Best program fit

Pull, Legs, Lower

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

    Toe position (dorsiflexed vs pointed); foot rotation in/out for medial/lateral bias.

  2. Step 2

    ROM / tempo / bias

    Pause and squeeze at the top; slow eccentric; lengthened partials.

  3. Step 3

    Implement swap

    Seated leg curl (more stretch), Nordic curl, or single-leg curl for imbalances.

Substitutions

Approved fallback

Seated leg curl (more stretch), Nordic curl, or single-leg curl for imbalances.

Compare all hamstrings options

The Evidence

Isolates the knee-flexion role of the hamstrings. Does NOT train the hip-extension role — pair it with an RDL.

SFR — 2.3

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