Bulgarian split squats get their name from a single event in the late 1980s, when an assistant coach from Bulgaria’s national weightlifting team toured the United States and talked about the training methods behind one of the most dominant Olympic programs in the world. The exercise stuck. The name stuck even harder.
The 1980s Tour That Started It All
Angel Spassov, an assistant coach for the Bulgarian Weightlifting National Team, traveled across the U.S. in the late 1980s giving lectures on the Bulgarian training system. At the time, Bulgaria was producing world-class Olympic weightlifters at a rate that baffled Western coaches, so anything associated with their methods drew intense interest. During these presentations, Spassov discussed a rear-foot-elevated split squat as part of Bulgarian training.
American strength coaches latched onto the exercise and, naturally, started calling it the “Bulgarian split squat.” The name was more marketing than anything else. Attaching “Bulgarian” to a leg exercise gave it an aura of Eastern Bloc sports science, the same mystique that made Soviet training manuals bestsellers in Western gyms during the Cold War era. Whether Bulgarian lifters actually used this specific exercise as a core part of their program is debatable. Some coaches who’ve studied the Bulgarian system closely have called the connection exaggerated, even calling the name a “fairy tale.” But by the time anyone pushed back, the name had already cemented itself in gym culture worldwide.
What the Exercise Actually Is
A Bulgarian split squat is a single-leg squat where your rear foot rests on an elevated surface behind you, like a bench or a box. You lower your body by bending the front knee until your thigh is roughly parallel to the floor, then drive back up. The rear leg provides some balance but does minimal work. Almost all of the load falls on the front leg.
The technical name you’ll see in research papers is “rear foot elevated split squat,” sometimes abbreviated RFESS. It’s the same exercise. There’s no meaningful biomechanical difference between an RFESS and a Bulgarian split squat. The two terms are interchangeable, and which one someone uses usually just depends on whether they come from an academic or gym background.
Why the Name Matters Less Than the Setup
One detail that actually matters more than the name is how high you set the bench. The elevated surface should sit below your knee, ideally around mid-shin height. When the bench is too high, your back leg gets overstretched, your hips tilt into an awkward position, and your lower back absorbs stress it shouldn’t. A standard gym bench (about 17 to 18 inches) is often too tall for shorter lifters. If you feel a deep, uncomfortable pull in the hip flexor of your rear leg, the surface is probably too high.
How It Compares to a Regular Squat
Because you’re working one leg at a time, you’ll use significantly less total weight than in a back squat. At an intermediate level, a typical male lifter handles around 135 pounds on a Bulgarian split squat compared to about 287 pounds on a back squat. For women at the same level, it’s roughly 76 pounds versus 161. That’s not a sign of weakness. The balance demands and single-leg loading make the exercise far more challenging per pound than it looks.
The muscle activation profile also shifts. Research using EMG sensors shows that the Bulgarian split squat produces very high activation in the quadriceps (both the inner and outer portions) and high activation in the gluteus medius, the muscle on the side of your hip responsible for pelvic stability. That outer hip activation sits around 47% of maximum voluntary contraction, which is notably higher than what a standard bilateral squat typically demands from that muscle. The hamstrings contribute at a moderate level. One study found that during the lifting phase, the Bulgarian split squat produced higher quad and hamstring activation than both a regular squat and a standard split squat.
For building muscle, though, single-leg and double-leg exercises appear to produce comparable results. A meta-analysis published in Sports Medicine found no significant difference in muscle growth between unilateral and bilateral training protocols. So the Bulgarian split squat won’t build bigger legs than a back squat, but it won’t build smaller ones either. The real advantage is practical: it trains balance, challenges hip stability, and lets you load each leg independently, which helps if one side is stronger than the other.
How a Cold War Nickname Became Permanent
The fitness industry loves a good origin story, and “Bulgarian split squat” has all the ingredients: a mysterious foreign training system, a charismatic touring coach, and an era when Eastern European athletes seemed to have cracked some secret code. The name survived because it’s memorable and specific. “Rear foot elevated split squat” is accurate but clunky. “Bulgarian split squat” sounds like something that builds champions.
It’s worth knowing that Bulgaria’s weightlifting dominance came primarily from extraordinarily high training frequency and volume on the classic Olympic lifts (the snatch and the clean and jerk), not from any single accessory exercise. The split squat with an elevated rear foot existed long before Spassov’s tour and was used in various forms across different countries. Bulgaria simply got the naming rights because the right coach showed up at the right time in the right country.