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legsintermediateReviewed by Dr. Ananya Iyer, DPT

Machine Hack Squat

Fixed 45-degree sled squat offering immense quad stretch and pure knee flexion.

Recommended Sets3–4 Sets
Rep Range8–10 Reps
Rest Period90s Rest
Equipmentmachine

3D Visual Form & Technique Demonstration

Biomechanically verified form execution and joint angle cues.

Official Video Tutorial · 3D Biomechanics & Form DemonstrationWatch on YouTube
How to Execute the Machine Hack Squat

Place shoulders against pads, back flat on backrest. Position feet in middle of platform shoulder-width.

  • Primary Muscle: LEGS
  • Secondary Synergists: GLUTES
  • Rest Interval: 90 seconds between sets

Machine Hack Squat Anatomy Activation

Primary motor unit recruitment for legs with secondary synergist stabilizers.

Primary (legs)
Secondary Synergists
Anterior (Front View)
Anterior Muscle Recruitment: legsFront anatomical silhouette highlighting legs in orange as active agonist.
● Primary Target View
Posterior (Back View)
Posterior Muscle Recruitment: legsBack anatomical silhouette highlighting legs in orange as active agonist.
Secondary / Stabilizer View
Anatomical PlaneSagittal Plane
Primary KinesiologyKnee Extension & Hip Flexion
Biomechanical VectorSuperior vertical drive through patellar tendon
Active Anatomy:Primary: legsSynergist: glutes
Figure: Biomechanical muscle recruitment model for legs. Highlighted in orange is the primary agonist motor unit; highlighted in blue are synergistic stabilizing groups (glutes).

Step-by-Step Execution Guide

1

Place shoulders against pads, back flat on backrest.

2

Position feet in middle of platform shoulder-width.

3

Disengage safety locks and lower sled down until thighs pass 90 degrees.

4

Drive up through whole foot without locking knees violently.

Common Mistakes & Form Fixes

Placing feet too high, losing quad focus.

Allowing lower back to peel off pad.

Biomechanical Safety & Injury Warning

Keep lower back pinned to pad at all depths.

Alternative Exercises & Swaps

If the equipment is occupied or you need a joint-friendly variation, substitute with these approved movements:

Barbell Back Squatlegs
View Form
45-Degree Leg Presslegs
View Form
Rohan Varma, CSCS
Authored By
Rohan Varma, CSCSHead Strength Coach & Biomechanics Lead
Dr. Ananya Iyer, DPT
Medically Reviewed By
Dr. Ananya Iyer, DPTChief Medical & Biomechanics Reviewer
Last Reviewed & Verified: 2026-03-29
Read our Medical Fact-Checking Standards
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