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Crucible is a precision strength training system built around your body, your equipment, your location, and your time.

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Exercise guide

Cluster

  • Advanced
  • Compound
  • Rep-based
  • Back
  • Lower arms
  • Lower legs
  • Shoulders
  • Upper arms
  • Upper legs
  • Waist

The Cluster is an explosive compound movement combining a squat clean and a thruster, designed to build total-body power, strength, and metabolic conditioning. It integrates a heavy pull, a deep front squat, and a powerful overhead press into one seamless repetition.

Reviewed by the Crucible team · Updated June 2026

Watch the Cluster demonstrationGuided video and your full workout live in the Crucible app.

Muscles worked

Primary

  • Adductors
  • Calves
  • Glutes
  • Hamstrings
  • Quadriceps

Secondary

  • Obliques
  • Serratus anterior

Equipment

  • Barbell

Setup

  1. Stand with feet hip-width apart, with the barbell positioned over the mid-foot.
  2. Hinge at the hips and grip the bar just outside your shins using an overhand or hook grip.
  3. Lower your hips until your shins touch the bar, keeping your chest up, back flat, and shoulders slightly ahead of the bar.
  4. Engage your lats and core to create full-body tension before the initial pull.

How to do it

  1. Inhale and pull the bar explosively by extending your hips and knees, keeping the bar close to your body.
  2. As the bar reaches mid-thigh, shrug your shoulders and rapidly pull yourself under the bar into a deep front squat.
  3. Catch the bar in the front rack position and, without pausing at the bottom, drive upward aggressively through your heels.
  4. Exhale forcefully as you use the momentum from the squat to press the bar overhead until your arms are fully locked out.

Form checklist

  • Keep the bar path vertical and as close to the torso as possible during the pull.
  • Maintain high elbows in the front rack position to keep the chest from collapsing.
  • Ensure full hip extension during the clean before dropping into the squat.
  • Drive the head through the 'window' created by the arms at the top of the press.
  • Keep your core braced throughout to protect the lower back during the transition.

Pro tips

  • Utilize the 'stretch-shortening cycle' by using the bounce at the bottom of the squat to fuel the overhead press momentum.
  • Focus on a fast elbow turnover during the catch to ensure the bar sits securely on the deltoids rather than the wrists.
  • Maintain a rhythmic breathing pattern: inhale on the setup/drop and exhale sharply at the peak of the press.

Make it harder

  • Implement 'Touch-and-Go' repetitions where the bar only briefly kisses the floor between reps to increase time under tension.
  • Shorten the rest intervals between sets to maximize the cardiovascular and metabolic demand.

Frequently asked

What muscles does the cluster work?
The cluster primarily targets the adductors, calves, glutes, hamstrings, and quadriceps, and also works the obliques and serratus anterior as secondary muscles.
What equipment do you need for the cluster?
The cluster uses barbell.
Is the cluster good for beginners?
The cluster is rated advanced. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • Burpee Over The DumbbellIntermediate · calves, glutes, hamstrings, and quadriceps
  • Burpee ShuffleIntermediate · calves, glutes, hamstrings, and quadriceps
  • Burpee Single Leg JumpIntermediate · calves, glutes, hamstrings, and quadriceps
  • Burpee Two Star JumpsAdvanced · calves, glutes, hamstrings, and quadriceps

Train this with a plan, not guesswork

Crucible builds the cluster into a precise program around your body, equipment, location, and time.

Download on the App Store