FITBODY Exercise Library · Legs
Air Squats
Air squats, also called bodyweight squats, are one of my favorite do anywhere movements. They warm up the quads, get your heart rate up, and build real lower body strength with no equipment at all.
What Is an Air Squat?
An air squat, or bodyweight squat, is a squat performed using just your body weight with no additional load or equipment. It targets your quads, hamstrings, glutes, and core, and it is the foundation every loaded squat variation is built on.
You will see it used heavily in CrossFit and in conditioning circuits, largely because it needs nothing and scales by reps rather than by weight. For the women I coach, it is usually the first squat we work on, since getting the pattern right without load makes everything that comes after it safer and more productive.
How to Do an Air Squat
Push your hips back before you bend your knees. That order matters more than anything else on this list. When women start by bending the knees, the weight travels forward onto the toes, the chest drops, and the lower back takes over. Hips first, then knees. If you are not sure you are doing it, stand a foot in front of a chair and reach your hips back until you just brush it. Your body will work out the pattern faster than any cue I can give you!
What Muscles Do Air Squats Work?
The quadriceps and gluteus maximus do most of the work, extending your knees and hips to drive you back up. Your hamstrings and adductors assist, your calves stabilize the ankle, and your core and erector spinae hold your torso upright throughout. Your gluteus medius is quietly busy the whole time keeping your knees tracking over your feet rather than caving inward.
See the full muscle breakdown
- Quadriceps: extend the knee out of the bottom and control the descent. This is where most women feel an air squat first.
- Gluteus maximus: drives hip extension on the way up, and works harder the deeper you go.
- Hamstrings: assist with hip extension and help stabilize the knee joint.
- Gluteus medius: keeps the knees tracking over the feet. When it gives out, the knees cave.
- Adductors: contribute to hip extension and control the inner thigh through the range.
- Calves and ankles: stabilize you and demand real dorsiflexion, which is why ankle mobility often limits depth.
- Core and erector spinae: hold your torso upright so your chest does not drop toward the floor.
Benefits of Air Squats
- Builds leg strength. Air squats strengthen the legs effectively, and as you add reps your leg muscles become more capable.
- Trains a functional movement. Squatting mimics everyday actions like sitting down and standing up, which makes it one of the most directly useful movements you can practise.
- Needs no equipment. You can do them anywhere, which matters more than anything else for consistency.
- Works multiple muscle groups at once. Because they recruit a lot of muscle simultaneously, air squats contribute meaningfully to the energy you burn in a session.
- Improves hip and ankle mobility. Regularly squatting through a full range maintains the joint range that tends to disappear without practice.
How Far Down Should You Squat?
Depth depends on your individual mobility, flexibility, and comfort. The general guideline is at least parallel, meaning your thighs reach a point parallel to the ground or slightly below.
Parallel depth is the common standard. It engages your leg muscles effectively while keeping form manageable for most women.
Full depth, with the hips below the knees, suits those with good mobility and flexibility. It is not a requirement and it is not inherently better for everyone.
Partial squats are perfectly fine if mobility limits you. Just maintain good form and avoid rounding your back. A clean partial squat beats a deep one done badly.
Your body structure matters too. Femur length and torso proportions change what depth looks and feels like for you, which is why comparing your squat to someone else’s is rarely useful. The quality of the squat is more important than the depth, so prioritize a straight back, knees aligned with your toes, and an engaged core throughout.
Sets and Reps
Air squats are programmed by reps rather than load, so they suit higher rep work than a loaded squat would.
| Goal | Sets | Reps |
|---|---|---|
| Warm up before lower body | 1 to 2 | 10 to 15 |
| Strength and endurance | 3 | 15 to 20 |
| Conditioning or circuit work | 3 to 4 | 20 to 30 |
Rest 30 to 60 seconds between sets. Air squats work well at the start of a lower body day to warm the quads and hips, or inside a circuit for conditioning. Progress by slowing the tempo, pausing at the bottom, or moving to a loaded variation rather than endlessly adding reps, which is how progressive overload applies to a bodyweight movement.
Variations and Modifications
Box or Chair Squat
Squat back to a chair or box, touch lightly, and stand. This teaches the hips back pattern better than any verbal cue and gives you a depth target you can lower over time. Where I start most women.
Tempo Squat
Take three seconds to lower, pause for one at the bottom, then stand. Removing speed removes momentum and makes the same bodyweight considerably harder. My preferred progression before adding load.
Pulse Squat
At the bottom of the squat, pulse up and down slightly before standing all the way up. This increases time under tension and is a good conditioning finisher.
Jump Squat
Add explosiveness by jumping off the ground as you rise. This turns the movement plyometric and adds a genuine power and bone loading element. See my full guide to squat jumps.
When you are ready to load the pattern, move to the barbell back squat, the front squat, or the sumo squat. For lateral hip work, the Cossack squat covers a plane the standard squat never touches.
Common Mistakes to Avoid
- Knees caving inward. Your knees should track over your toes throughout. A knee that collapses inward usually means the gluteus medius is not holding up yet.
- Rounding the back. Keep your back straight and avoid rounding or over arching your spine during the squat.
- Not reaching depth. Aim for at least parallel to get the most out of the movement, within whatever range your mobility allows.
- Bending the knees before the hips. Starting at the knees shifts your weight onto your toes and drops your chest. Hips back first, every time.
- Rushing the reps. Bouncing out of the bottom uses momentum rather than muscle. Control the descent and drive up deliberately.
Air Squat FAQs
What is an air squat?
An air squat, also called a bodyweight squat, is a squat performed using only your body weight with no additional load or equipment. You stand with your feet shoulder width apart, push your hips back, lower until your thighs are roughly parallel to the ground, then drive back up through your heels. It targets the quads, hamstrings, glutes, and core, and it is the foundation that every loaded squat variation builds on. You will see it used heavily in CrossFit and conditioning circuits because it needs nothing and scales by reps.
What muscles do air squats work?
The quadriceps and gluteus maximus do most of the work, extending your knees and hips to drive you back up. Your hamstrings and adductors assist with hip extension, and your calves stabilize the ankle. Your gluteus medius works continuously to keep your knees tracking over your feet rather than caving inward, and your core and erector spinae hold your torso upright throughout. That combination is why a movement with no equipment still qualifies as a genuine compound exercise.
Are air squats bad for your knees?
Not inherently. If you feel joint pain, it usually points to form rather than the exercise itself. The most common cause is putting your weight toward your toes instead of through your heels, and the second is not turning your feet out slightly. Worth knowing that the common advice to never let your knees pass your toes is not well supported. Research found that artificially restricting forward knee travel reduced knee torque but transferred substantially more force into the hips and lower back. What matters is that your knees track over your feet. If you have good form and still feel pain, stop and consult your doctor or physical therapist.
How far down should you squat?
Aim for at least parallel, meaning your thighs reach a point parallel to the ground or slightly below. Some women with good mobility can go deeper with the hips below the knees, and that is fine but not required. If mobility limits you, partial squats are perfectly acceptable provided you maintain good form and avoid rounding your back. Your body structure matters too, since femur length and torso proportions change what depth looks like for you. The quality of the squat is more important than the depth.
How many air squats should I do?
For a warm up before lower body work, 1 to 2 sets of 10 to 15 is plenty. For strength and endurance, use 3 sets of 15 to 20, and for conditioning or circuit work you can go to 20 to 30 reps for 3 to 4 sets. Rest 30 to 60 seconds between sets. Rather than endlessly adding reps, progress by slowing the tempo, pausing at the bottom, or moving to a loaded squat variation once the bodyweight version is comfortable.
Why does my lower back hurt during air squats?
Back discomfort in a bodyweight squat usually comes from leaning your chest too far forward, which shifts load off your legs and into your lower back. That forward lean is often caused by starting the movement at the knees rather than the hips, or by limited ankle mobility pulling you forward as you descend. Push your hips back first, keep your chest up, and shorten your depth until you can hold the position. If you use good form and still experience pain, avoid the movement and consult your doctor or physical therapist.
References
- Fry, Andrew C., J. Chadwick Smith, and Brian K. Schilling. “Effect of Knee Position on Hip and Knee Torques During the Barbell Squat.” Journal of Strength and Conditioning Research, vol. 17, no. 4, 2003, pp. 629 to 633, pubmed.ncbi.nlm.nih.gov/14636100. Found that restricting forward knee travel reduced knee torque but transferred force to the hips and lower back, concluding appropriate joint loading may require the knees to move slightly past the toes. The study used seven trained men performing barbell squats, so treat it as directional.
- Cleveland Clinic. “Quadriceps Muscles: Location, Anatomy & Function.” my.clevelandclinic.org/health/body/22816-quad-muscles.
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I’m Julie Lohre, an IFBB Fitness Pro and certified personal trainer and nutrition specialist. For more than 20 years I have helped women over 40 get stronger, leaner, and more confident through personalized online coaching built around their real lives.