Barbell Cossack Squat
Also known as: cossack squat with barbell, cossack squat barbell, barbell side split squat, barbell cossack squats, back rack cossack squat
- Secondary muscles
- Glutes, Hamstrings, Calves
- Body part
- Upper Legs
- Position
- Standing
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Shifting your weight over one bent leg while the other stays straight loads the adductors through a lateral range no forward or reverse lunge reaches. Keep the bar light relative to your split squat numbers and treat it as loaded mobility work; depth and control matter far more than the number on the bar.
How to do the Barbell Cossack Squat
- Stand with your feet wider than shoulder-width apart, toes pointing slightly outward.
- Hold a barbell across your upper back, resting it on your traps.
- Engage your core and keep your chest up as you lower your body down into a squat position, bending at the knees and hips.
- As you lower, push your knees out to the sides and keep your weight on your heels.
- Lower until your thighs are parallel to the ground, then push through your heels to return to the starting position.
- Repeat for the desired number of repetitions.
Tip: Keep most of the weight in the front foot and think of pushing the floor away rather than standing up.
Muscles worked
Primary
Quads · Legs
The front quad controls the descent and drives you back up, and it takes an especially heavy load on split squats where the stance is fixed.
Secondary
- Glutes — The glute of the front leg extends the hip, and leaning the torso forward slightly with a longer stride shifts more work onto it.
- Hamstrings — The hamstrings of the front leg assist the glutes in hip extension and control the knee on the way down.
- Calves
Common mistakes
- Front knee caving inward — the knee should track over the second toe; if it drops in, widen the stance slightly and push the knee out.
- Stepping too short — a short stride pushes the knee far past the toes and shifts everything onto the quad and knee; lengthen the step so the shin stays fairly upright.
- Leaning forward and rounding — keep the torso tall and the chest up, and let the back knee drop straight down rather than reaching forward.
- Pushing off the back foot — drive back up through the front heel; the back leg is just there for balance.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 4–5 × 3–6 | 2–3 min |
| Muscle growth | 3–4 × 6–12 | 90–120 s |
| Endurance | 2–3 × 12–20 | 60 s |
Lunges and split squats go after squats or deadlifts as the main single leg movement, or first on a lighter day. Superset them with a Romanian deadlift using the same dumbbells for a complete lower body pair.
Variations and alternatives
Similar exercises
Without barbell
Frequently asked questions
What muscles does the Barbell Cossack Squat work?
The Barbell Cossack Squat primarily works the quads. It also involves the glutes, hamstrings and calves, which assist the movement and stabilise the joints.
Is the Barbell Cossack Squat good for beginners?
It is rated intermediate, so it suits people who already train regularly. Beginners can still do the Barbell Cossack Squat with light load and a spotter or coach watching the first few sessions; if it feels awkward, pick an easier variation from the alternatives below first.
What can I do instead of the Barbell Cossack Squat?
If you cannot do the Barbell Cossack Squat, try the Suspension Bulgarian Split Squat, the Split Squat or the Dumbbell Bulgarian Split Squat. Each of them trains the quads through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Barbell Cossack Squat, a sensible starting point is strength: 4–5 × 3–6 with 2–3 min rest; muscle growth: 3–4 × 6–12 with 90–120 s rest; endurance: 2–3 × 12–20 with 60 s rest. Put it early in the session while you are fresh, before isolation work for the same muscles.
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