Upper Legs Exercise · Barbell

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Barbell Squat (on Knees)

Also known as: Bb Squat (On Knees)

Category

Upper Legs

Equipment

Barbell

Target

Quads

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Biomechanical cues verified by the PlanWorkouts Science Review Board under CSCS editorial oversight; see our editorial standards.

Squatting from a kneeling position removes the ankles and lower legs from the movement entirely, isolating the hip and knee extension pattern of the upper legs. It's an unusual variation, occasionally used to target the quads and glutes without the mobility demands a standing squat places on the ankles. Use padding under the knees and keep the weight conservative given the unusual joint stress.

How to Do the Barbell Squat (on Knees)

1. Begin kneeling on the floor with your knees hip-width apart and your toes pointing forward.
2. Rest a barbell across your shoulders, gripping it overhand with your hands slightly wider than shoulder-width.
3. Brace your core and keep your chest lifted as you slowly lower your body by bending your knees, keeping your back straight.
4. Keep lowering until your thighs are parallel to the floor, or as far as you can comfortably go.
5. Pause briefly at the bottom, then drive through your heels to return to the starting position.
6. Repeat for your planned rep target, maintaining clean technique and steady breathing on every repetition.

Biomechanical & Joint Load Cues

Operates primarily in the sagittal plane involving knee flexion/extension and hip extension. Peak mechanical tension occurs in the deep lengthened position at the bottom transition. Maintain midfoot balance and an upright torso angle.

Common Mechanical Mistakes & Form Errors to Avoid

• Knee Valgus (Inward Collapse): Allowing knees to cave inward during the ascent places excessive tensile stress on the MCL and lateral meniscus. Drive knees out in line with second toes.
• Excessive Forward Pitch: Allowing the chest to drop and hips to shoot up turns the squat into a good-morning, transferring load off the quadriceps onto the lumbar erectors.
• Heel Lift & Weight Shift: Shifting balance forward onto the balls of the feet compromises stability and increases patellar tendon strain. Keep weight distributed over midfoot.

Proper Breathing Patterns & Core Engagement

Perform a deep abdominal brace (Valsalva maneuver) into the diaphragm before initiating descent. Hold intra-abdominal pressure through the bottom transition, exhaling past the sticking point on ascent.

Injury Modification & Joint Safety

Lifters experiencing acute patellofemoral knee discomfort should moderate depth to parallel or utilize box squats to reduce peak anterior patellar shear. If joint irritation persists, immediately stop and substitute this movement with another exercise from the Upper Legs exercises category.

Muscles Worked

The Barbell Squat (on Knees) primarily targets the Quads, with Glutes as the primary synergist muscle group, along with the Hamstrings, Calves.

More Upper Legs Exercises

All Fours Squad Stretch Body Weight · Quads Arms Apart Circular Toe Touch (male) Body Weight · Glutes Assisted Lying Glutes Stretch Assisted · Glutes Assisted Lying Gluteus And Piriformis Stretch Assisted · Glutes Assisted Prone Hamstring Assisted · Hamstrings Assisted Prone Lying Quads Stretch Assisted · Quads

More Quads Exercises

Backward Jump Body Weight · Quads Balance Board Body Weight · Quads Band One Arm Single Leg Split Squat Band · Quads Band Single Leg Split Squat Band · Quads Barbell Bench Front Squat Barbell · Quads Barbell Bench Squat Barbell · Quads

Equipment Alternatives

Don't have barbell? These target the same quads with different equipment.

Backward Jump Body Weight · Quads Band One Arm Single Leg Split Squat Band · Quads Dumbbell Goblet Squat Dumbbell · Quads Intermediate Hip Flexor And Quad Stretch Rope · Quads

FAQ

What muscles does the Barbell Squat (on Knees) work?

The Barbell Squat (on Knees) primarily targets the quads as the primary agonist. Synergist assistance is provided by the glutes along with the hamstrings, calves. Maintaining strict biomechanical alignment ensures maximal tension remains focused on the intended muscle fibers rather than shifting to surrounding stabilizer joints.

What equipment do I need for the Barbell Squat (on Knees)?

The Barbell Squat (on Knees) is performed using a barbell. Ensure all equipment is securely positioned with collars or safety pins locked before loading working sets. If you train in a home gym or minimal setup, explore our equipment-free and resistance band alternatives below.

What is the most common form mistake on the Barbell Squat (on Knees)?

The most frequent error is knee valgus (inward collapse): Allowing knees to cave inward during the ascent places excessive tensile stress on the MCL and lateral meniscus. Drive knees out in line with second toes.. Controlling the 2 to 3-second eccentric lowering phase ensures maximal hypertrophic stimulus while shielding connective tissue.

How many sets and reps should I perform on the Barbell Squat (on Knees)?

For muscle hypertrophy and size, aim for 3 to 4 working sets of 8 to 12 repetitions at 70% to 80% of your 1RM with 90 to 120 seconds rest. For absolute strength development, prioritize 4 to 5 sets of 3 to 6 heavier reps with 2 to 3 minutes rest.

What's a good alternative to the Barbell Squat (on Knees)?

If you don't have access to a barbell, the Backward Jump targets the same quads using body weight instead. This alternative replicates the same joint angle and movement plane while allowing you to train effectively with different available gear. You can also substitute it seamlessly in our free Workout Plan Builder.