Squat Muscles Worked – Introduction
The sheer number of squats muscles worked explains why many consider the squat to be the number one free weight exercise on the planet!
Squats target and develop nearly every muscle group in your body, as well as your cardiovascular system.
If you want to build muscle, get stronger, or improve your athletic performance in just about any sport, you need to squat.
And even if you are not an athlete, the squat is the perfect prescription to improve your functional mobility and how you look and feel.
With squats, you can dramatically transform your entire body.
Squats trigger complete body transformation because the squat movement works nearly all your lower and upper body muscles.
Few weight training exercises, besides the deadlift, can match the muscles involved in all squat variations like:
- jump squats
- front squats
- goblet squats
- pause squats
- Bulgarian split squats
- single-leg squats (aka pistol squats)
- box squats
- low bar squats
- high bar squats
This article explains the muscles worked when you do squats, specifically the barbell back squat, which will help you understand why squats are so effective!
What muscles do squats work the most?
Table of Contents
- Why squats are so powerful
- How squats work your lower body
- How squats work your upper body
- How to squat with a barbell
- Muscles worked by squats – Summary
Why squats are so powerful
Targeting all the muscles of your body is the reason that the humble squat is so powerful.
Therefore, a squat workout routine using linear progression will change your body even if you’re a beginner.
In summary, weighted squats:
- builds muscle all over your body,
- fights obesity,
- builds confidence, and
- boosts your mood
The most basic squat, meaning a bodyweight squat (not using weights), is also excellent for conditioning and mobility.
And bodyweight squats are probably the best place for a beginner to start.
Still, to build strength, you need to follow a linear progression program like the 3×5 workout plan, where you add weight gradually.
This article focuses on the most critical muscles worked during squats and illustrates why barbell or dumbbell squats are excellent tools to improve your fitness, whether you are an athlete or not.
Note: This post is for educational information, not medical advice, diagnosis, or treatment.
Always take the PAR-Q form questionnaire and consult with your doctor before starting a squat program.
How squats work your lower body
#1. Quadriceps and hamstrings
Your quadriceps femoris muscle is a four-headed muscle group on the front of your thigh which covers the femur bone.
The quadriceps are one of the strongest muscles in the human body, which accounts for the transformative power of squats.
Squats will work your legs hard, specifically your quadriceps.
The quadriceps include:
- Rectus femoris
- Vastus intermedius
- Vastus lateralis
- and Vastus medialis
When you see an image of the quadriceps, you can only see three heads, the rectus femoris and the vastus lateralis and medialis, because the intermedius is beneath the rectus femoris.
For example, see the quadriceps image of your thigh muscles below:
See further quadriceps details in this video:
Hamstrings
Opposite your quadriceps on the back of your thighs are your hamstrings, another great link of your posterior chain.
Your hamstring muscle group includes the:
- biceps femoris
- semimembranosus and
- semitendinosus
#2. Calves
- Gastrocnemius
- Soleus
- Achilles tendon
#3. Adductor muscles group
As opposed to dumbbell squats, barbell squats also work the adductor group muscles because you place your feet in a broader stance with your toes slightly pointed to 11 am and 1 pm.
This wider position of the barbell squat engages the adductor group muscles as you lower and lift your torso.
The adductor muscles help you move your thighs to your body’s midline and away from your midline.
They are also known as the hip adductors and are composed of:
- Adductor Brevis
- Adductor Longus
- and Adductor Magnus
- The adductor minimus part of the Adductor Magnus.
- Pectineus
- Gracilis
Like the gluteus maximus, the adductor Magnus is one of the biggest muscles in the human body.
#4. Gluteal muscles group
- Gluteus maximus
- Gluteus medius
- and gluteus minimus
There are about 640 muscles in the body.¹
The largest muscle in your body is the gluteus Maximus, the biggest of the three gluteal muscles, also known as the buttocks.
Therefore, the squat is an excellent lower body exercise to train your quadriceps, glutes, adductors, and hamstrings.
Because squats heavily engage the gluteal muscles, the traditional squat is an effective exercise to create power for runners.
For example, Saquon Barkley, one of the most electrifying running backs in the NFL, built his lower body strength through squats.
A squat variation that primarily works the quadriceps and gluteal muscles are dumbbell squats.
Now you can see how the squat works your entire leg, from the front to the back.
Squats work the muscles you can see in your lower legs, the quadriceps, and the ones that you cannot, your glutes and hamstrings.
The muscle groups targeted are your quadriceps on the front of your thigh and your hamstrings on the back.
While the hamstrings only act as stabilizers during the squat, the quadriceps are the primary muscles that the squat works in your legs.
Do front squats to put more emphasis on your quadriceps.
If you do front squats, you will typically use less weight than the classic squat.
The front squat is an excellent exercise to mimic the movement in the Olympic snatch.
To see some impressive demonstrations of the Olympic snatch, see this article on the spectacular Dmitry Kolokov and his halting snatch deadlift warmup for the Olympic snatch.
In summary, the squats work all the major muscle groups of your entire lower body.
Squats muscles worked in your upper body
#5. Erector spinae muscles
The Erector Spinae muscle consists of three columns of muscles:
- Iliocostalis,
- Longissimus, and
- Spinalis
Each muscle column runs parallel to the outer sides of the vertebra.
They extend from the lower back of the skull down to the Pelvis.
‘The Erector Spinae provides resistance that assists in bending forward at the waist.
Also, they act as powerful extensors to promote your back’s return to the erect position.’ Source Credit: CustomPilatesAndYoga.com
These are powerful muscles that help you bend forward and return to a standing position.
The spinal erectors run down your back, from the base of your skull to the lower vertebrae.
When you squat, you work your entire posterior chain, from your hips and knees up to your head.
#6. Abdominal core and obliques
- Rectus abdominis
- Transverse abdominis
- Internal obliques
- External obliques
The squat activates almost every muscle in your body, including your abdominal muscles, as well.
One of the most critical actions you must take when you squat is to brace your core.
This tightening of your core muscles is also known as blocking.
Before you begin the descent with the barbell for any squat variation, you must take in a deep breath of air and contract your abdominal muscles.
Bracing your body in this manner creates intrathoracic pressure, which means stability for the thorax region of your body, which is between your abdomen and neck.
This pressure helps you stabilize and support your spine while you perform a weighted squat.
#7. Upper back and Latissimus dorsi muscles
Besides the erector spinae muscles, squats also work your upper back muscles, especially your latissimus dorsi muscles, as you brace and balance the weight on your back.
How to Squat with a Barbell
A brief synopsis of how to barbell squat:
Squat gear:
Get the proper footwear for squats—the best shoes for squats and deadlifts in 2024 detail the reasons at length.
But, in short, you need to use shoes with a flat sole that is not compressible but has a solid grip on the floor without the lack of stability that can result in a knee injury.
The next most important piece of equipment for the squat is a squat rack.
Never squat without a power rack.
While the squat is a powerful movement that can turn you into an athlete or look like one, it still carries some risk.
Therefore, always be safe and squat inside a squat rack, whether you work with a personal trainer or not.
Unrack the barbell:
- Rack a 45-pound Olympic barbell approximately chest height in front of you.
- Grab the bar about with a shoulder-width grip or a drop wider.
- Duck your head under the barbell and get your shoulders under the barbell.
- Let the barbell sit across your back a bit above your posterior deltoids.
- The barbell should sit on the ‘shelf’ of your traps across your shoulders. This barbell position is called a high bar squat.
- Stand to full height with the barbell across your back and firmly pull the barbell down onto your shoulders. This action seems counterintuitive, but it is a helpful cue to solidify your body together with the barbell, whether you have weights on the barbell or not.
- Step back when you unrack the barbell.
Alan Thrall Squats Tutorial – How To Squat: Low Bar
Foot position and descent:
- Take a wide stance
- Your feet should be a bit wider than shoulder-width
- Point the toes of your shoes to 11 am for your left foot, and 1 pm for your right foot, approximately 30 degrees.
- Now take a deep breath, brace, and begin your descent by pushing your hips back as if you will sit in a chair.
- This action of pushing your hips back is called a hip hinge.
- Maintain the brace throughout the squat, on the descent, and the ascent.
- As you lower your torso, make sure to keep your knees tracking over your toes.
- You accomplish this knee position by consciously moving your knees out, as is suggested in this squat workout routine for powerlifting and fitness.
- No products found. is an excellent warmup tool to prevent your knees from caving inwards.
- Never let your knees cave inwards.
- Feel like your feet and shins up to your knees are screwed into the floor in cement.
- As your hips hinge back, bend your knees and lower your torso till the crease of your hips drops below the top of your knee joint.
- This depth is called a squat depth below parallel and is considered the full range of motion in competitive powerlifting.
The ascent – how to generate power to stand
- As soon as your hips reach below parallel, pull the barbell down on your body even more, and drive your feet into the floor, which will generate the force necessary for you to stand up.
- Think of doing a leg press against the ground.
- Keep a neutral back by lifting your chest and maintaining the intrathoracic pressure created by your deep breath before beginning the squat.
- Until you reach a standing position
Squats Muscles Worked – Wrapping Up
You cannot compare the number of squats muscles targeted to most other weight training exercises.
Take the ever-popular biceps curl, for example.
Think of the size of your bicep.
Now, think of the size of the entire back half of your body.
Although you cannot see the rear of your body, you know that the muscles from your heels up to your neck are much larger than your biceps.
If squats only worked your entire leg muscles, the squat would still be superior to curls.
But, squats use many more muscles than just your legs.
The squat requires a forceful push against the floor to lift yourself to a standing position from a squat position.
This drive engages your quadriceps, hamstrings, adductors, calves, glutes, erectors, abdominals, and upper back muscles as well.
This total muscle usage of squats is why you should not waste your time only doing only curls, machine leg extensions, or only shoulder presses.
Also, squats require ankle, knee, and hip extension simultaneously, which is why squats are called a compound movement in contrast to the biceps curl, which consists of single-joint elbow flexion alone.
What’s Next
The bottom line is that squats are one of the most valuable compound exercises you will ever do.
Squats can improve your performance as an athlete or only improve your functional daily activities and quality of life.
The following steps on your fitness journey are:
1. An excellent squat workout routine for beginners (including warmup), and
2. The 3×5 Workout Plan: The Only Strength Training Program You Will Ever Need
But, if you need to lose weight first, follow these five simple steps to lose 20 pounds in 3 months.
Once you are ready to start squats, use the beginner squat workout routine mentioned above, and experience the transformative power of barbell squats muscles worked on your mind and body.
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