One Leg Barbell Squat
Also works: Calves · Glutes · Hamstrings
A Bulgarian split squat with a barbell on your back: rear toe on a bench, front leg doing the work, torso upright. It loads one leg through a long range with a fraction of the spinal load of a back squat, and it will expose a left-to-right difference you never noticed squatting on two legs.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Use a bench or box roughly knee height — around 40 cm. Higher tips you forward and turns it into a hip stretch.
- Unrack the bar as for a back squat, then walk into position; do not try to set up first and pick the bar up afterwards.
- Place the rear foot on the bench with the top of the foot down or the toe hooked over the edge — whichever your ankle tolerates.
- Set the front foot roughly 60-70 cm ahead of the bench, then test: at the bottom, your front shin should be near vertical and your knee over the mid-foot.
- Square your hips forward and brace before the first descent. Take a practice rep with the empty bar to confirm the distance.
Every rep
Breathing & tempo — One breath per rep: in at the top, held through the descent and the drive, out at lockout. Three seconds down, no bounce off the bottom, controlled up. Reset the breath before the next rep rather than rushing while balancing.
Before you load it
- Set up inside a rack with the pins at your bottom position. Bailing from a split stance is much clumsier than from a normal squat, so give yourself somewhere to put the bar.
- If the front of your rear hip pinches sharply, move the front foot further forward or lower the bench. Do not stretch through that sensation under load.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start with the empty 20 kg bar and expect it to be enough for several sessions. A solid intermediate marker is bar weight equal to half your bodyweight for 8 clean reps per leg. Add 2.5 kg only once both legs complete every rep at full depth with no rear-leg push and no sideways drift.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Shuffle the front foot 10-15 cm further forward and retest. You want the front shin close to vertical at the bottom and no pinch at the front of the rear hip.
Put only the toe on the bench and put 90% of your weight on the front heel before you descend. If the rep still needs the back leg, the weight is too heavy.
Start with the empty 20 kg bar for a full set of 8 per leg before adding a single plate. Your balance, not your quad, is the first limiter.
Always start the set with the weaker leg, and cap the strong leg at exactly that number. The whole reason to do this lift unilaterally is to stop the gap widening.
Widen the stance laterally by 10-15 cm so the feet are on two rails rather than a tightrope. Balance should be a minor cost, not the exercise.
Why bother
With the rear foot elevated, the trailing leg contributes almost nothing to the drive — it is a kickstand for balance. The front leg gets close to the load a bilateral squat would give it, but with roughly half the bar on your back, so the quads and glutes get worked hard while your spine and lower back get a comparatively easy day.
It also finds asymmetries a back squat happily hides. Squat on two legs and the stronger side quietly takes 55% of the work for years. Split the movement and the weaker side has nowhere to send the load, which is why the first few sessions usually feel humiliating on one side.
Where it fits
Main lift on a second leg day, or first accessory after a hinge. Three or four sets of 6-10 per leg. Always lead with the weaker side and match its reps on the strong side. Two sessions a week is workable; the balance demand means it degrades badly when you are already exhausted.
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Asked and answered
How high should the bench be?
About knee height, roughly 40 cm. Anything higher tips your pelvis and turns the movement into a hip flexor stretch on the rear leg; anything lower and the rear leg starts contributing to the drive. If a standard bench feels too tall, use a low box or a plate stack.
How does the weight compare to my back squat?
Expect roughly 30-40% of your back squat on the bar, per leg, once you are competent. That still means each leg is handling more load relative to itself than in the bilateral squat, because the second leg is not helping. Do not judge this lift by the plate count.
Should I use a barbell or dumbbells?
Dumbbells if balance is your limit — hanging weight at your sides lowers the centre of mass and makes it much easier to stay upright. Switch to the bar once your legs, not your balance, decide the set, because the bar lets you keep loading past what you can hold in your hands.
Is it a problem that my front knee goes past my toes?
No. In a split stance with the rear foot elevated, some forward knee travel is unavoidable and it is part of what gives the front quad its long range. The setup error to fix is the opposite one — standing too close to the bench so the knee is jammed forward from the first centimetre.