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Prepared for your lower body workout? I’ve already covered my preferred hamstring exercises and those targeting your glutes (also known as your buttocks). Now, let’s focus on the primary muscle group associated with leg strength: the quadriceps.
Understanding the Quadriceps
The quadriceps consist of four muscles located at the front of your thighs. These muscles include:
Rectus femoris (the muscle that extends vertically along the center of your thigh)
Vastus lateralis (located on the outer side of your thigh)
Vastus medialis (situated on the inner part of your thigh)
Vastus intermedius (found beneath the rectus, in the central area of your thigh)
For those who love diving into details, you can explore comprehensive visuals of each muscle here. All four muscles merge into a single large tendon at the knee, which connects to your kneecap.
These muscles are responsible for extending your knee. Three of them (those with “vastus” in their names) originate from the upper part of your thighbone. When they contract, they tug on the kneecap, which in turn pulls the front of your shin, straightening the knee.
The rectus femoris, the fourth muscle in this group, starts at the front of your pelvis. It not only extends your knee but also assists in flexing your hip. (For instance, during a high-knees march, your hip flexors, including the rectus, help lift your knees upward.)
Another term you might encounter is the VMO, or vastus medialis oblique. This refers to a section of the vastus medialis with diagonal fibers.
To effectively target the quads, we need exercises that involve knee extension. Given the size of these muscles, significant resistance is required to truly challenge them. Ready to dive in?
Top quad exercise: Squats
I understand you might be curious about alternatives, and I’ll share some less common options below. However, squats remain one of the most effective leg exercises, and it’s worth discussing why.
During a squat, you bend your knees and hips until you’re in a semi-seated posture (often described as sitting in an invisible chair) and then rise back up. Popular squat variations include:
Bodyweight squats, where you only use your own body as resistance
Goblet squats, involving a dumbbell or kettlebell held at chest height
Barbell squats, with the bar positioned on your back (options include low bar and high bar placements, depending on comfort)
Front squats, where the bar is placed on the front of your shoulders
These are ranked approximately by difficulty level. Beginners typically start with bodyweight squats before progressing to goblet squats. As your leg strength increases, you may find the weight you can hold for goblet squats insufficient, prompting a move to barbell squats. (However, starting with barbell squats from the beginning is also an option, so don’t feel obligated to follow a strict progression.)
Maximizing squat effectiveness if depth is an issue
Squats can be challenging to master, but don’t dismiss them if you’ve had difficulties before.
For many, limited ankle flexibility is the main obstacle to performing a proper squat. Achieving a full squat—where thighs are parallel to or below the ground—requires sufficient ankle bend to allow knee movement. Longer thighbones demand greater ankle mobility. If your heels lift during squats, ankle mobility is likely the culprit. Exercises to improve ankle mobility can be beneficial. Squatting itself enhances ankle mobility, and practicing deeper squats over time can improve your range. (Consider pausing at the bottom of each squat during warm-ups.)
Raising your heels can also help. A simple method is to place small weight plates under your heels. If available, a slant board at your gym can serve the same purpose. Professional weightlifters often use specialized shoes with a built-in wedge. This isn’t cheating—it’s a strategic choice. Even with good ankle mobility, I wear squat shoes to optimize my body positioning and strength.
Remember, there’s no rule requiring squats to reach or go below parallel. It’s better to perform partial squats than to abandon them entirely. Half-squats are excellent for strengthening the quadriceps and are often more relevant for athletic activities like running and jumping.
The key to squatting above parallel is maintaining consistency. My preferred methods for achieving this are:
Box squats. Position a plyo box or bench behind you (angled so you sit on the edge) and lightly touch the box with your butt during each repetition.
Anderson squats. Use a squat rack and adjust the safety bars to a manageable height. Gently tap the bar on the safeties with each rep.
No barbell? Opt for the leg press
If you’re at a gym like Planet Fitness without barbells but still want to train your legs with heavy resistance, the leg press is a great alternative. Various types of leg press machines (horizontal, vertical, hack squat, etc.) all serve the same purpose: allowing you to extend your legs against resistance in a motion similar to squats.
Top single-leg squat variation: Bulgarian split squats
Bulgarian split squats are excellent glute workouts, but they also target the quads. Keeping your torso upright during the exercise shifts more focus to the quadriceps of your leading leg.
To perform Bulgarian split squats, place one foot on a bench or support behind you and bend your front leg to move the weight up and down. The weight can be dumbbells held in your hands, resting on your shoulders, or a barbell on your back—these are the most common ways to add resistance.
If Bulgarian split squats aren’t your preference, try regular split squats (both feet on the ground), step-ups onto a platform, or lunges in any direction (forward, backward, or walking lunges are popular options).
Best isolation exercise for quads: Leg extension machine
All the squat variations mentioned (including split squats) engage your quads while also targeting your glutes and hamstrings. However, if you want to focus solely on your quads, the leg extension machine is ideal.
There’s a misconception that this machine is “harmful to your knees,” as there’s always someone claiming certain exercises are universally bad for knees. I once avoided this machine because I was told “physical therapists despise it.” Yet, after tearing my ACL and needing post-surgery quad rehabilitation, what machine did my physical therapist consistently use? The leg extension.
If the machine causes knee discomfort, the issue is likely your positioning. The machine’s pivot or hinge should align with your knee, not be too far forward or backward. Adjusting this will make the machine much more comfortable.
Best-kept secret: Somersault squats
What if you lack a barbell or leg machines? Goblet squats and kettlebell front squats are excellent, but here’s a unique option—tricky to set up but incredibly effective once mastered. Meet the somersault squat, a closed-chain quad exercise that mimics quad isolation without gym equipment:
The concept involves pressing your forearms into your hip creases while holding a weight. Ensure your arms remain stable to prevent the weight from shifting, keeping it in contact with your thighs.
Next, extend your knees without extending your hips. The name “somersault” squat likely comes from the motion where your head lowers and your butt rises, mimicking the start of a somersault. Grab a heavy object and embrace the intensity.
