TRX Bulgarian Split Squat
What Is the TRX Bulgarian Split Squat?
TRX Bulgarian Split Squat is a compound exercise that primarily targets the quads and also engages the glutes, adductors and hamstrings. It is an intermediate-level movement in which the rear foot rests in the foot cradle of a suspension trainer while the front foot stays planted, so the body lowers into a split squat with the back leg sliding behind it instead of resting on a bench.
Swapping the bench for a strap changes the support more than the muscle work. In a study of 20 physically active men, a bodyweight split squat with the rear foot in a TRX foot cradle produced front-leg muscle activity similar to the same movement with the rear foot on a bench, while the front leg pushed harder into the floor. Because the cradle swings rather than holding still, the front leg takes more of the body's weight and the hips and trunk work to keep the rear leg from drifting.
The front-leg quads do most of the work, the glutes and adductors drive the hip up out of the bottom, and the gluteus medius keeps the knee and pelvis level. Next to a floor lunge, the suspended rear leg raises the hip demand: in 30 healthy adults, putting the rear foot in a TRX strap increased gluteus maximus, gluteus medius, hamstring and adductor activity over a standard forward lunge, with no change in the rectus femoris. A slight forward lean of the torso shifts more of the work toward the glutes, while a tall torso keeps the emphasis on the quads.
The TRX Bulgarian Split Squat suits anyone who can already do a steady Bodyweight Bulgarian Split Squat and wants single-leg strength and balance work without extra weight, which makes it useful for home, outdoor and team sport training. If the swinging strap makes the bottom position shaky, build up first with the bench version or the TRX Reverse Lunge, where both feet stay on the floor and the hands hold the straps. For heavier loading later, the Dumbbell Bulgarian Split Squat is the easier version to progress.
Muscles Worked
- Vastus Lateralis
- Primary
- Vastus Medialis
- Primary
- Gluteus Maximus
- High
- Gluteus Medius
- High
- Adductor Magnus
- Medium
- Rectus Femoris
- Medium
- Soleus
- Low
- External Oblique
- Minimal
Instructions
- Adjust the suspension trainer so the foot cradle hangs at about mid-calf height.
- Stand facing away from the anchor and place the top of one foot in the foot cradle behind you, laces facing down.
- Stand tall on the front leg with the rear knee bent and both knees roughly side by side, hands on your hips and eyes forward.
- Brace your abs and keep your hips square to the front.
- Bend the front knee and hip to lower your body while the rear foot slides back in the cradle and the rear leg reaches behind you.
- Keep the whole front foot flat and the front knee in line with the second and third toes, with a slight forward lean of the torso.
- Lower under control until the front thigh is about parallel to the floor and the rear knee hovers just above it.
- Push through the whole front foot to stand back up, letting the rear foot travel forward with the cradle to the start position.
- Complete all reps on one leg, then switch sides.
Common Mistakes
Pushing down into the cradle
Driving the rear foot into the strap swings it backward and takes load off the front leg, so the rear leg should only follow along.
Front heel lifting
Shifting onto the toes of the front foot pushes the knee forward and puts the load on the front of the knee instead of the whole leg.
Knee caving inward
Letting the front knee collapse toward the midline loses hip control and strains the knee, so keep it tracking over the second and third toes.
Hips twisting toward the strap
Letting the hip on the suspended side drop or rotate back as the leg slides away loads the front leg unevenly and twists the lower back.
Overreaching with the rear leg
Sliding the rear foot too far back arches the lower back and pulls hard on the front of the rear hip.
Dropping too fast
Falling quickly into the bottom lets the strap swing and makes balance and knee control much harder to keep.
Injuries
TRX Bulgarian Split Squat is a low risk exercise when performed with proper technique. With no external load, the main risks come from balance and position rather than heavy force: losing control as the foot cradle swings, the front knee drifting inward or taking the load at the front of the knee, and the rear hip flexors and quads being stretched hard when the rear leg slides too far back.
Set the cradle at about mid-calf height, lower slowly and keep the whole front foot flat on the floor. Keep the front knee in line with the second and third toes, and stop the rear leg once the front thigh is about parallel to the floor rather than chasing more depth. Setting up beside a wall or post you can touch for balance makes the first sessions safer.
If balance or knee control breaks down, go back to the Bodyweight Bulgarian Split Squat with the rear foot on a stable bench, or to the TRX Reverse Lunge, where the hands hold the straps for support. Once every rep stays steady, progress by slowing the lowering phase, pausing at the bottom or holding a dumbbell at the chest.
Stop if you feel sharp pain at the front of the knee, pinching at the front of the rear hip or pain in the lower back, and get it checked if knee pain lingers after training.
- Primary Focus
- Quads
- Equipment
- Suspension trainer and body weight
- Modality
- Strength
- Difficulty
- Intermediate
Alternative Exercises
Other Names for the TRX Bulgarian Split Squat
The TRX Bulgarian Split Squat is also known as:
- TRX Suspended Lunge
Frequently Asked Questions
- Q: Is the TRX Bulgarian Split Squat harder than the bench version?
It usually feels harder because the foot cradle swings, so you have to balance and steady the rear leg as well as lift your body weight. The front leg does a similar amount of muscle work in both versions, so the extra challenge comes from stability rather than more load. Get steady on the Bodyweight Bulgarian Split Squat first.
- Q: How high should the foot cradle hang?
Set it at about mid-calf height. A higher cradle pulls the rear hip and thigh into a deeper stretch at the bottom, so lower it if you feel a strong pull at the front of the rear hip.
- Q: Should my back knee touch the floor?
No. Lower until the back knee hovers just above the floor and the front thigh is about parallel to it, because touching down takes tension off the front leg and can knock the strap out of position.
- Q: Can I add weight to the TRX Bulgarian Split Squat?
Yes, once every rep is steady you can hold a dumbbell or kettlebell at your chest. For heavier loading, the Dumbbell Bulgarian Split Squat with the rear foot on a bench is easier to progress.
- Q: How is it different from the TRX Reverse Lunge?
In the TRX Reverse Lunge both feet stay on the floor and the hands hold the straps for support, so it is the easier exercise. Here the rear foot is in the cradle and the hands are free, so the front leg carries most of the body weight and all of the balance.