Bulgarian Split Squats: Building Unilateral Leg Strength and Balance

Put one foot up on a bench behind you, drop into a lunge, and you’ll quickly discover why the Bulgarian split squat has a reputation as one of the most humbling leg exercises in strength training. A modest amount of weight in each hand can feel far heavier than the same load on a barbell back squat, and your balance will wobble in ways a bilateral squat never reveals.

That difficulty is the point. By training one leg at a time, the Bulgarian split squat exposes and corrects strength imbalances that two-legged lifts like the back squat can quietly hide, while also building the hip stability and balance that carry over directly into sports, running, and everyday movement.

What Makes It “Unilateral” and Why That Matters

Most people have a dominant leg that does slightly more work during bilateral (two-legged) exercises like squats and leg presses, often without the lifter noticing. Over months and years, that imbalance can compound, contributing to asymmetries in strength, stability, and even injury risk on one side.

Unilateral training — working one limb at a time — forces each leg to handle its fair share of the load independently. Research on single-leg training consistently shows it improves balance and stability more effectively than bilateral-only programs, likely because it demands greater activation from stabilizing muscles around the hip and ankle that a two-footed stance can partially outsource to the other leg.

Muscles Worked and Why This Exercise Is So Effective

The Bulgarian split squat primarily targets the quadriceps, glutes, and hamstrings of the front (working) leg, with significant secondary demand on the hip stabilizers, adductors, and core to keep you from tipping sideways. The elevated rear foot increases range of motion at the front hip and knee compared to a standard lunge, which several studies suggest may increase glute activation specifically.

Because it’s performed standing on one leg with the other elevated behind you, it also builds a genuinely useful skill: single-leg balance and control under load, which directly transfers to running, stairs, and recovering your footing when you stumble — something a barbell squat, performed on two stable feet, doesn’t train nearly as directly.

• Heavy emphasis on quadriceps, glutes, and hamstrings of the working leg
• Strong secondary demand on hip stabilizers and core
• Improves single-leg balance and coordination
• Exposes and helps correct left-right strength asymmetries

How to Perform a Bulgarian Split Squat With Good Form

Stand a comfortable stride length in front of a bench or step, roughly two to three feet depending on your height. Rest the top of one foot on the bench behind you, laces down, and settle your weight into the front foot before you begin moving.

1. Set your front foot flat on the ground, far enough forward that your knee stays roughly over your ankle at the bottom of the movement
2. Lower your body by bending the front knee and hip, keeping your torso mostly upright
3. Descend until your back knee is close to the floor or your front thigh is roughly parallel to it
4. Drive through the front heel and mid-foot to return to standing
5. Complete all reps on one side before switching legs

Most of your weight should stay on the front leg throughout — the rear foot on the bench is there for balance, not to bear significant load. If you feel most of the effort in your back leg, your stance is likely too short.

Common Mistakes and How to Fix Them

The most frequent error is standing too close to the bench, which pushes the front knee far past the toes and shifts stress onto the knee joint rather than the glutes and hamstrings. Lengthening your stance usually fixes this immediately.

Wobbling and losing balance is common for beginners and generally improves with practice rather than added weight — resist the urge to load up before your stability is solid. Leaning too far forward or letting the front knee cave inward are two other common issues that reduce effectiveness and increase joint strain.

• Stance too short, pushing the knee excessively past the toes
• Adding weight before balance and control are established
• Letting the front knee collapse inward during the movement
• Rushing the descent instead of controlling it

How to Apply This: A Sample Progression

Because balance is often the limiting factor before strength is, a gradual progression works best for most people new to the movement:

1. Weeks 1-2: Bodyweight only, 3 sets of 8-10 reps per leg, focused entirely on balance and control
2. Weeks 3-4: Add light dumbbells (one in each hand), 3 sets of 8 reps per leg
3. Weeks 5-6: Increase weight gradually, 3-4 sets of 6-8 reps per leg
4. Ongoing: Rotate in periodically alongside bilateral lifts like squats or deadlifts, 1-2 times per week

The WHO recommends adults perform muscle-strengthening activities for all major muscle groups at least twice weekly, and unilateral exercises like this one are an efficient way to combine strength, balance, and mobility training in a single movement rather than treating each as a separate goal.

Who Should Be Cautious

Anyone with significant knee pain, recent lower-body injury, or balance disorders should approach this exercise carefully and may want guidance from a physical therapist or trainer before adding load. Holding onto a wall or sturdy object with one hand is a reasonable modification while building confidence and stability, and there’s no rule that says you must progress to a fully unassisted version if a modified approach continues to serve your goals safely.

As with any new strength exercise, starting light and prioritizing full range of motion and control over the amount of weight lifted will produce better long-term results and lower injury risk than rushing toward heavier loads.

Are Bulgarian split squats better than regular squats?

Neither is strictly “better” — they train different qualities. Bilateral squats allow heavier overall loading and are efficient for building total leg strength, while Bulgarian split squats emphasize unilateral strength, balance, and correcting side-to-side imbalances. Most well-rounded programs include both.

Why can’t I balance during this exercise?

Balance difficulty is normal at first and typically improves within a few weeks of consistent practice. It reflects underused stabilizing muscles around the hip and ankle rather than a lack of overall strength.

How much weight should I use when starting out?

Start with bodyweight only, or very light dumbbells, until you can complete all reps with control and without significant wobbling. Add weight gradually from there.

Is knee pain during this exercise normal?

Mild muscular fatigue is expected, but sharp or persistent knee pain is not. Check your stance length first, since a too-short stance is the most common cause of knee discomfort in this exercise, and consult a healthcare provider if pain continues.