Bulgarian Split Squat: How to Do It, Muscles Worked and Mistakes to Avoid

The Bulgarian split squat is a single-leg squat done with your back foot raised on a bench behind you. It works the quadriceps and glutes hard, along with your inner thighs and balance, and it needs little or no weight to do it. It suits anyone building leg strength at home, anyone who would rather not squat with a barbell, and anyone with one leg weaker than the other.

How to do a Bulgarian split squat

1. Set up the bench. Use a bench, sturdy chair or step at knee height or a little lower. Stand facing away from it, about two feet in front.
2. Place your back foot. Reach one leg back and rest the top of that foot on the bench, laces down. Tucked toes are fine if they feel better.
3. Test your stance. Do one slow rep. If your front heel lifts or your knee shoots far past your toes, move the front foot farther out. If you feel stretched out and wobbly, bring it in a little.
4. Brace. Stand tall, tighten your midsection and look straight ahead, with most of your weight on the front foot.
5. Lower. Bend your front knee and drop your back knee straight down toward the floor over 2 to 3 seconds. Stop when your front thigh is close to parallel, with your front knee pointing the same way as your toes.
6. Stand up. Pause briefly, then push through the heel and middle of your front foot to rise. Don’t bounce out of the bottom.
7. Switch legs. Finish all your reps on one side, then swap. Start with your weaker leg and match its reps on the stronger one.

Form cues

• Treat the back foot as a kickstand. In 26 trained men, the front foot produced about 84% of the upward force, and the back foot did little beyond holding up the leg’s own weight (1).
• Go straight down and up, rather than lurching forward.
• Keep your front knee over your second or third toe, and your whole front foot flat.
• Breathe in on the way down, breathe out as you stand.
• Feel it in your front thigh and glute, with a stretch at the front of your back hip.

Muscles worked

Your front hip and knee bend and straighten under nearly all your body weight, so the quadriceps and glutes do most of the work, helped by the adductors and hamstrings. The gluteus medius keeps your pelvis level and your knee in line.

It looks like a knee exercise, but it is hip dominant. In 20 trained men, the hip did far more work than the knee or ankle in both the Bulgarian split squat and the barbell back squat, and the front knee bent through less range in the split squat (2). In eight rugby players using their 10-rep-max loads, the hip extension effort per leg at the bottom was 44% greater in the rear-foot-elevated split squat than in the back squat, despite the far lighter weight (3).

When 11 trained people took each exercise close to failure, gluteus maximus and quadriceps activity was similar in the split squat, the single-leg squat and the Bulgarian version, which drew more hamstring activity than the ordinary split squat (4). Activation shows which muscles work, not which will grow.

Training studies show it does build muscle. In 24 trained men who did Bulgarian split squats for six weeks, the outer quadriceps thickened by about 8 to 9%, whether a leg trained heavy or light with blood flow restriction (5). A 2025 meta-analysis of nine trials found one-leg and two-leg training built similar amounts of muscle, while strength gains followed the style people trained (6).

Common mistakes

• Standing too close to the bench. The front knee shoots forward and the heel lifts. Fix: step the front foot farther out and test it with one slow rep.
• Pushing off the back foot. Fix: keep the back leg relaxed and let the front leg lift you. If you can’t, use a lower bench.
• A bench that is too high. It strains the front of the back hip and can make the back knee ache. Fix: use a lower step. If the stretch is the limit, see our guide to tight hip flexors.
• The front knee caving in. Fix: aim the knee over your middle toes, use less weight and end the set when it drifts.
• Folding forward or rounding your back. Fix: a slight lean from the hips is fine, but keep your back flat and braced.
• Too deep, too fast. Fix: take 2 to 3 seconds on the way down. If your knees are sensitive, lower only partway and add depth over a few weeks.

Variations: easier and harder

If your knees complain, the reverse lunge and the step-up train the same muscles with less knee bend. If holding weights bothers your wrists or back, wear a loaded backpack instead.

Sets, reps and how often

The rep ranges and rest periods below follow the American College of Sports Medicine’s position stand on resistance training (7). Reps are per leg, and the set counts are practical starting points. We stop the strength range at 4 to 6 reps, because very heavy single-leg sets are hard to balance.

The ACSM recommends two to three sessions a week for beginners, and adding 2 to 10% to the load once you can do one or two reps more than your target (7). A meta-analysis of 21 studies found light loads built as much muscle as heavy ones when sets were taken to failure, though heavy loads built more maximal strength (8). Bodyweight reps taken close to failure count.

For adults over 60, less can be plenty: a network meta-analysis of 151 trials found lower-volume programs were the most effective for physical function and muscle size, while moderate to higher volumes did more for leg strength (9).

Bulgarian split squats for glutes or quads?

Both, and you can tilt it either way. In 21 trained women, leaning the trunk forward raised activity in the gluteus maximus, a hamstring and the rectus femoris compared with staying upright (10). In 20 trained women, the rear-foot-elevated split squat produced more outer-quadriceps activity over the whole rep than the hip thrust, and its glute and hamstring activity peaked at the bottom, while the hip thrust peaked at the top (11).

• More glutes: a slightly longer stance, a small forward lean from the hips, full depth, and drive through the front heel. Pair it with the hip thrust.
• More quads: a slightly shorter stance, an upright torso, and let your front knee travel forward with the heel down.

The stance advice is coaching experience, not a tested rule.

Why is the Bulgarian split squat so hard?

One leg does almost all the work, about 84% of the force in the study above (1), on a narrow base you have to balance. The hip works harder per leg than in a squat (3), each rep spends a long time deep in the movement, and the back hip is stretched the whole set. That difficulty is also why a light weight goes so far.

Is a 20 lb Bulgarian split squat good?

We found no research-based standard for Bulgarian split squat weights. For most beginners, 8 to 12 controlled bodyweight reps per leg is the first goal, and 20 pounds in total is solid progress beyond that. A better test: 8 to 12 smooth, full-depth reps on each leg with one to three in reserve.

Bulgarian split squat vs squat

Both build the same muscles. In 18 academy rugby players training twice a week for five weeks, a rear-foot-elevated split squat program improved back squat strength as much as back squat training did, and the reverse was also true (12). The split squat needs no rack; the squat lets you load both legs heavily. The squat is often called the king, or mother, of all exercises, but no study crowns a single best one.

Is it safe? Who should be careful

For most adults, yes. Burning thighs and next-day soreness are normal. Stop if you feel sharp pain, or if your knee swells, locks or gives way.

• Knee worries. Pain usually comes from a short stance, too much depth too soon, a caving knee or an already irritated kneecap, not the exercise itself. Our guide, are Bulgarian split squats bad for your knees?, covers the research and a knee-friendly setup.
• Shaky balance. Hold a wall or sturdy chair, and add weights only once you are steady.
• Hip replacement. Ask your surgeon or physical therapist how far you may bend and stretch the hip.
• High blood pressure or heart disease. Breathe out as you stand, and ask your doctor about heavy loads.
• Pregnancy. The American College of Obstetricians and Gynecologists says that without complications, exercise in pregnancy is safe and desirable, though routines may need adjusting (13). As balance shifts, hold a support or switch to a split squat with both feet on the floor.

See a physical therapist or doctor if pain lasts more than a few days, worsens from session to session, or changes how you walk. Read our medical disclaimer.

Watch it done

Our video on Bulgarian split squat mistakes that hurt your knees is dedicated to this exercise, and our steps follow it: the couple-of-feet setup, dropping the back knee toward the floor over two to three seconds, the brief pause and the drive through the front heel and midfoot. It shows four of the faults above (standing too close, pushing off the back leg, the knee caving in and folding forward) and how to scale it both ways.

Looking for your next move? Browse every guide in our exercise library, sorted by muscle group, equipment and level.

Sources

1. Helme M, et al. Is the rear foot elevated split squat unilateral? An investigation into the kinetic and kinematic demands. J Strength Cond Res. 2022;36(7):1781-1787. PubMed 32796420
2. Mackey ER, Riemann BL. Biomechanical differences between the Bulgarian split-squat and back squat. Int J Exerc Sci. 2021;14(1):533-543. PubMed 34055144
3. Arakawa H, et al. Greater hip moments in rear-foot-elevated split squats than in conventional back squats with the same relative intensity of loads. J Strength Cond Res. 2023;37(5):1009-1016. PubMed 36542838
4. Mausehund L, et al. Muscle activation in unilateral barbell exercises: implications for strength training and rehabilitation. J Strength Cond Res. 2019;33 Suppl 1:S85-S94. PubMed 29870422
5. Wang Y, et al. Unilateral low-load blood flow restriction vs. high-load training in the Bulgarian split squat: a randomized within-subject design on strength, hypertrophy, and asymmetry. Front Physiol. 2026;17:1786733. PubMed 41983008
6. Kassiano W, et al. Comparison of muscle growth and dynamic strength adaptations induced by unilateral and bilateral resistance training: a systematic review and meta-analysis. Sports Med. 2025;55(4):923-936. PubMed 39794667
7. American College of Sports Medicine. American College of Sports Medicine position stand. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2009;41(3):687-708. PubMed 19204579
8. Schoenfeld BJ, et al. Strength and hypertrophy adaptations between low- vs. high-load resistance training: a systematic review and meta-analysis. J Strength Cond Res. 2017;31(12):3508-3523. PubMed 28834797
9. Radaelli R, et al. Effects of resistance training volume on physical function, lean body mass and lower-body muscle hypertrophy and strength in older adults: a systematic review and network meta-analysis of 151 randomised trials. Sports Med. 2025;55(1):167-192. PubMed 39405023
10. Aygun-Polat E, et al. Targeted muscle activation in Bulgarian split squat variations: effects of trunk position and suspension-based execution. BMC Sports Sci Med Rehabil. 2025;17(1):251. PubMed 40867012
11. McCurdy K, et al. Hip and knee extensor activation during the hip thrust and rear-foot-elevated split squat in trained females. J Strength Cond Res. 2021;35(5):1201-1207. PubMed 33900255
12. Speirs DE, et al. Unilateral vs. bilateral squat training for strength, sprints, and agility in academy rugby players. J Strength Cond Res. 2016;30(2):386-392. PubMed 26200193
13. American College of Obstetricians and Gynecologists. Physical activity and exercise during pregnancy and the postpartum period: ACOG Committee Opinion, Number 804. Obstet Gynecol. 2020;135(4):e178-e188. PubMed 32217980