Single-Leg Squat
The Single-Leg Squat is an advanced unilateral lower body movement that challenges balance, stability, strength, and proprioception through bodyweight-only training. This challenging exercise is ideal for advanced fitness enthusiasts and athletes seeking improved unilateral leg strength, balance development, and functional movement capability. The single-leg squat demands exceptional ankle, knee, and hip stability while building quadriceps strength and muscular endurance.
NASM’s evidence-based approach recognizes unilateral training as essential for identifying strength imbalances, improving stability, and building functional strength applicable to sport and daily activities. The single-leg squat improves balance, proprioception, corrects asymmetries, and translates to improved athletic performance and movement quality.
How to Perform a Single-Leg Squat
Step 1: Setup
Stand on one leg with your weight distributed evenly across your foot. Hold onto a sturdy support or extend your arms forward for balance assistance.
Step 2: Brace/Position
Lift your non-working leg with your knee bent at approximately 90 degrees or extended forward. Engage your core and prepare for controlled descent into the squat.
Step 3: Execute/Drive
Lower your body into a squat by bending your planted knee and hip, descending as deep as mobility and balance allow. Maintain upright torso position and control throughout the descent.
Step 4: Return/Descent
Drive through your planted leg to stand back up to the starting position. Maintain balance and control throughout the movement. Perform all repetitions on one leg before switching sides.
Muscles Worked
Primary Muscles:
- Quadriceps -- primary mover for knee extension and single-leg squat strength
- Glutes -- assist in hip extension and provide stability for the movement
Secondary Muscles:
- Hip Stabilizers
- Hamstrings
- Core Stabilizers
- Ankle Stabilizers
Common Mistakes
- Using too little support, causing loss of balance and inability to maintain proper form
- Allowing the planted knee to cave inward, which indicates poor motor control and hip stability
- Leaning excessively forward, which shifts weight distribution and reduces quadriceps engagement
- Not descending to adequate depth, which limits lower body stimulus and strength development
- Jerky or unstable movements, which indicate inadequate strength or stability for the exercise
Single-Leg Squat Variations
As part of NASM's evidence-based approach to movement and strength training, the single-leg squat reinforces proper movement mechanics essential to long-term performance and injury prevention. NASM-certified personal trainers use the Optimum Performance Training (OPT) model to integrate exercises like the single-leg squat into individualized programs based on each client's assessment results.
Ready to make fitness Your Career?
FAQs
Why is the single-leg squat considered an advanced movement?
Single-leg squats demand significant balance, proprioception, ankle stability, and unilateral strength that most individuals lack initially. The reduced base of support and increased demand on stabilizer muscles make this a legitimately advanced progression requiring substantial prerequisite strength and stability.
What support should beginners use when learning single-leg squats?
Beginners should use significant support such as holding a sturdy surface with both hands. As balance and strength improve, gradually reduce hand support. This progression allows for safer skill development and eventual achievement of unsupported single-leg squats.
How deep should a single-leg squat be performed?
Depth should be limited by mobility, stability, and control. Advanced exercisers may achieve parallel or deeper, while beginners may only squat to quarter-depth. Prioritize quality movement at shallower depths over jerky or unstable deeper ranges.