Bulgarian Split Squat.
The Bulgarian split squat is a rear-foot-elevated single-leg squat that puts roughly 85% of the load on the front leg. The elevation creates a deep hip flexor stretch on the rear leg and forces the front quad and glute to do real work without assistance from the other side.
Step by step.
Stand a couple of feet in front of a bench or low box around 12 to 16 inches tall, holding a dumbbell in each hand at your sides.
Rest the rear foot on the bench behind you, hooking the ball of the foot over the edge rather than laying the whole foot flat.
Adjust the front foot until your front knee will stack over the ankle at the bottom. For most people that lands around 2 to 2.5 feet from the bench.
Brace your core and keep your torso upright, then lower straight down by dropping the rear knee toward the floor.
Stop when your front thigh reaches about parallel and the rear knee sits a few inches off the ground. The rear knee should never touch.
Drive through the front heel to stand back up, keeping the weight in the front leg the whole time. Finish all reps on one side before switching.
The most common mistake is placing the rear foot wrong. Most people lay the top of the foot flat on the bench. That works at light loads, but heavy loads pull the ankle into plantarflexion and eventually the foot rolls off or the ankle hurts. A better position: rear foot with just the toes on the bench (ball of the foot hooked over the edge), or use a dedicated landmine attachment or foam pad that doesn't rotate under the foot. Some people find a low box preferable to a standard bench. Around 12-16 inches is enough elevation without the instability of a high, narrow surface.
Front foot distance from the bench is the primary setup variable most people get wrong. Too close and the front shin angles forward dramatically at the bottom, which stresses the knee. Too far and you can't get the rear knee anywhere near the ground. A starting point: place your front foot so the knee is stacked over the ankle at the bottom. For most people of average height, that means the front foot is 2 to 2.5 feet from the bench. You'll spend the first few sets adjusting this, and that's normal.
The descent should be straight down, not forward. Think about dropping your rear knee toward the ground rather than pushing your front knee out over your foot. Vertical torso throughout. If you're collapsing forward, your front foot is too far back, your hip flexors are tight on that rear leg, or both.
For loading: dumbbells held at your sides are the easiest entry point. A barbell on your traps works too and allows heavier loads, but it compounds the balance challenge significantly. A useful intermediate step is a goblet hold (kettlebell at chest), which shifts the center of mass forward slightly and helps some people stay more upright.
If the rear foot position keeps aggravating your hip flexor, the barbell lunge is the honest alternative. Both feet stay on the floor, so the back leg gets far less stretch while the front leg still does most of the work. Other single leg options that build the same front leg strength include the pistol squat and dumbbell step ups.
Common questions.
Pain at the rear knee usually means the knee is making contact with the floor, or coming close to it with load. The knee shouldn't touch. If depth is limited, the rear knee should stop a few inches above the floor. More commonly, rear knee pain traces to the hip flexor of the rear leg being stretched aggressively under load. If your hip flexors are tight, the bottom position puts them at full length while force is going through the joint. Reduce depth until you've built more hip flexor length through stretching and progressive exposure to the range.
The rear foot elevation changes three things: the range of motion is greater (the rear hip descends further), the hip flexor of the rear leg is stretched more aggressively through that range, and the front leg bears a greater percentage of the load because the rear leg is elevated and can't push through the floor as effectively. The Bulgarian split squat is genuinely harder than a lunge for most people despite looking similar on paper. It also demands more stability from the front leg, which is why many people find it harder at first even with lighter loads.
Dumbbells for most people, most of the time. Dumbbells held at your sides keep the center of mass lower and give you more freedom to balance without the barbell restricting your trunk position. A barbell on your back lets you load much heavier, but it compounds the balance challenge and puts more demand on the lower back to stay upright under the asymmetrical load. If you've built a solid base with dumbbells (say, 2x40s for controlled reps) and want to push the strength ceiling further, transitioning to a barbell makes sense. Front-loaded (goblet or front rack) versions are an underrated middle ground.
Start with your weaker leg. Most people have a strength and coordination asymmetry between sides, and starting with the weaker side means you perform that leg while fresher. You also set a rep cap for the stronger side based on what the weaker side managed, rather than letting the strong side accumulate more volume every session and widening the gap. After a few weeks of intentional weaker-side-first training, the asymmetry usually narrows.
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