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  3. Exercises
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  5. Legs
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  7. Kettlebell Cossack Squat

Exercise guide

Kettlebell Cossack Squat

  • Intermediate
  • Compound
  • Rep-based
  • Lower legs
  • Upper legs

The Kettlebell Cossack Squat is a powerful lateral movement that develops elite hip mobility, adductor flexibility, and unilateral leg strength. It specifically targets the glutes and quads of the working leg while providing a deep eccentric stretch to the hamstrings of the straight leg.

Reviewed by the Crucible Fit team · Updated June 2026

Watch the Kettlebell Cossack Squat demonstrationVideo and instructions for every movement are in the Crucible Fit app.

Muscles worked

Primary

  • Glutes
  • Hamstrings
  • Quadriceps

Secondary

  • Adductors
  • Hip flexors

Equipment

  • Kettlebell

Setup

  1. Hold a kettlebell by the horns in a goblet position, tucked tight against your chest with elbows pointing down.
  2. Assume a very wide stance, roughly double shoulder-width apart, with toes pointed slightly outward.
  3. Engage your core and pull your shoulder blades back to create a stable shelf for the weight.

How to do it

  1. Inhale and shift your weight to one side by hinging your hips back and bending that knee, while keeping the opposite leg perfectly straight.
  2. Lower your hips as deep as mobility allows, ideally until the thigh is below parallel, while allowing the toes of the straight leg to pivot upward toward the ceiling.
  3. Exhale and drive forcefully through the heel of the bent leg to return to the center standing position.
  4. Alternate sides by repeating the movement on the opposite leg, maintaining a controlled and fluid tempo.

Form checklist

  • Keep the heel of the working (squatting) foot flat on the floor at all times.
  • Maintain an upright chest and neutral spine; do not let the kettlebell pull your torso forward.
  • Ensure the knee of the working leg tracks directly over the toes, avoiding internal collapse.
  • Keep the non-working leg fully extended with the knee locked to maximize the adductor stretch.

Pro tips

  • Think about 'pulling' your pelvis down into your hip socket on the working side to engage the deep hip stabilizers.
  • Pause for one second at the bottom of the movement to maximize the stretch-shortening cycle and improve active mobility.

Make it harder

  • Implement a 'low-switch' variation where you transition from side to side while staying in the bottom of the squat instead of standing up.
  • Increase the eccentric challenge by taking 3-4 seconds to lower into the squat.

Frequently asked

What muscles does the kettlebell cossack squat work?
The kettlebell cossack squat primarily targets the glutes, hamstrings, and quadriceps, and also works the adductors and hip flexors as secondary muscles.
What equipment do you need for the kettlebell cossack squat?
The kettlebell cossack squat uses kettlebell.
Is the kettlebell cossack squat good for beginners?
The kettlebell cossack squat is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • 3 Point Standing HopsIntermediate · calves, glutes, hamstrings, and quadriceps
  • 4 Cone Single Foot Lateral HopsIntermediate · calves, glutes, hamstrings, and quadriceps
  • 4 Way Single Leg HopAdvanced · calves, glutes, hamstrings, and quadriceps
  • Air Pillow Balance Counterbalanced Skater SquatAdvanced · glutes, hamstrings, and quadriceps

Train it with Crucible Fit.

Every movement in this library is in the app with video and instructions, ready for your own sessions on the days between Crucibles. Your first Crucible is on us.

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