TRX Cossack Squat
What Is the TRX Cossack Squat?
TRX Cossack Squat is a compound exercise that primarily targets the quads and inner thighs, and also engages the glutes. It is an intermediate-level movement in which you sink deep onto one leg in a wide stance while the other leg stays straight, with your hands holding the suspension handles for balance.
The move trains the body in the side-to-side plane, which most squats and lunges skip. The bent leg works like a deep single-leg squat, while the straight leg sits in a long adductor and hamstring stretch, so it builds strength and hip mobility in the same rep. That makes it a useful warm-up for lower-body days and a good fit for athletes who change direction often.
The straps act as a counterbalance. You can hold on lightly to stay upright and reach more depth than you could unassisted, which is why this version is a common step before the free Cossack Squat. The handles should steady you, not carry your weight, so the working leg still does the lifting.
If the movement feels too hard, start with the Bodyweight Lateral Lunge or the TRX Lateral Lunge, where the range is shorter and the trailing leg is bent less. Once you can sink deep with your heel flat and your torso tall, load it with a Dumbbell Cossack Squat or a Landmine Cossack Squat.
Muscles Worked
- Adductor Magnus
- Primary
- Vastus Lateralis
- Primary
- Vastus Medialis
- Primary
- Gluteus Maximus
- High
- Adductor Longus
- Medium
- Rectus Femoris
- Medium
- Erector Spinae
- Minimal
- Rectus Abdominis
- Minimal
Instructions
- Stand under the anchor point with the straps hanging straight down, and take a handle in each hand, palms facing in.
- Step your feet very wide, well beyond shoulder width, with the toes pointing forward or turned slightly out and the legs straight.
- Hold the handles in front of your hips with your elbows bent, and keep your chest tall and your eyes forward.
- Shift your weight onto one leg and bend that knee and hip, sitting back and down toward that heel while the other leg stays straight.
- Keep the bent knee over the toes and the heel flat, and let the toes of the straight leg point up with its heel down.
- As you sink, bring the handles up in front of your shoulders with your elbows bent, using them to stay balanced and upright.
- Lower as far as you can while keeping the torso tall and the heel flat, then pause briefly.
- Push through the heel of the bent leg to stand back up to the wide start position, lowering the handles to your hips.
- Repeat to the other side, and keep alternating for the full set.
Common Mistakes
Lifting the heel
The heel of the bent leg rises when depth goes past your ankle range, which shifts the load into the knee, so stop where the heel is still flat.
Pulling on the handles
Hauling yourself up or down with your arms turns the leg work into an arm pull, so keep the straps for balance only.
Collapsing the chest forward
A tight hip or weak legs make the torso fold toward the floor, so stay tall and shorten the range instead.
Letting the knee cave
The bent knee drifts inward past the foot, which stresses the knee, so push it out over the toes.
Stance too narrow
A step that is too short leaves little room to sink, so set the feet wide enough that the straight leg can fully extend.
Rushing the descent
Dropping fast into the bottom is where groin tweaks happen, so lower under control and build depth over weeks.
Injuries
TRX Cossack Squat is a medium risk exercise when performed with proper technique. The deep bend at the knee and the long stretch through the inner thigh are the demanding parts, so most problems come from forcing depth before the hips and ankles allow it.
The usual strain points are the inner thigh and groin of the straight leg, and the knee of the bent leg. Keep the bent knee tracking in line with the toes, and keep the heel down on both feet. A heel that lifts or a knee that drifts inward usually means you have gone past your current range. Warm up the hips first, and add depth a little at a time across sessions.
Use the handles for balance, not to pull yourself out of the bottom. If the range is too much, shorten it, or start with the TRX Lateral Lunge. Stop if you feel sharp pain in the groin, hip or knee, and skip the exercise while you have an active groin strain or knee pain until a clinician clears you.
- Primary Focus
- Quads and hips & groin
- Equipment
- Suspension trainer and body weight
- Modality
- Strength
- Difficulty
- Intermediate
Alternative Exercises
Frequently Asked Questions
- Q: How deep should I go?
Sink as low as you can while the heel of the bent leg stays flat and the torso stays tall. Depth comes from repeated practice, so add range a little at a time.
- Q: How many reps should I do?
A common starting point is 2 or 3 sets of 5 to 10 reps per side, two to three times per week. Use fewer reps if you move on to the loaded version.
- Q: How is this different from the standard Cossack squat?
The straps let you steady yourself with your arms, so you can reach more depth with better balance. Once you can stay upright while barely holding the handles, try the free Cossack Squat.
- Q: Why does the toe of my straight leg point up?
With the foot flat and the toes lifted, the straight leg keeps the heel down and holds the stretch through the inner thigh. If the foot turns out and the heel lifts, you have likely gone wider or deeper than your range allows.