Cossack Squats
The Cossack Squat is a unilateral lower-body exercise that combines deep knee flexion with significant hip mobility, strengthening the quadriceps, glutes, and adductors. By descending laterally while keeping one leg straight, it improves flexibility in the hips and ankles while correcting muscle imbalances.
Iridium identifies this as a high-mobility lunge variation and typically rotates it into your plan when your settings prioritize higher exercise variety. Before assigning it, the AI checks sub-muscle-group fatigue in your adductors and hips to ensure recent heavy leg days haven't compromised the necessary range of motion. Progression is tracked by comparing rep counts and RPE specifically against your body weight over time.
Form Cues
- Stand with feet significantly wider than shoulder-width
- Keep the heel of your working leg flat on the floor
- Point the toes of your straight leg toward the ceiling
- Keep your chest upright and spine neutral
- Drive through the bent leg to return to center
- Don't let the heel of your squatting leg lift off the ground
- Don't allow your working knee to collapse inward
- Don't round your lower back as you descend
- Don't let your chest collapse forward
Common Mistakes
- Lifting the heel of the working leg
- Rounding the lumbar spine (butt wink)
- Knee caving inward (valgus)
- Insufficient stance width
- Rushing the descent
Muscles Worked
This exercise primarily targets the quadriceps and glutes of the working leg, providing a powerful unilateral strength stimulus. It also heavily recruits the adductors (inner thigh) of the straight leg and actively engages the hip flexors and ankles to maintain stability through the deep range of motion.
Primary
Secondary
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