Quadriceps and Yoga: Quad Anatomy, Stretches and Strength

The quadriceps femoris, the quads, is the large muscle group on the front of the thigh. It has four heads: rectus femoris, vastus lateralis, vastus medialis and vastus intermedius. All four straighten the knee, and the rectus femoris also flexes the hip. In yoga you stretch the quads by bending the knee, and you stretch the rectus femoris by bending the knee with the hip extended, as in a low lunge with the back foot held.

Anatomy of the quadriceps

Quadriceps means "four heads". The four muscles start in different places on the pelvis and the thigh bone (femur). They join in one tendon, the quadriceps tendon, which wraps around the kneecap (patella). From the kneecap, the patellar ligament runs down to a bump on the front of the shin bone, the tibial tuberosity. When the quads contract, they pull on that line and straighten the knee.

Picture from body anatomy.

Rectus femoris

The rectus femoris runs down the middle of the thigh. It is the only head that starts above the hip joint: on the anterior inferior iliac spine, a small bony point at the front of the pelvis, and on the rim above the hip socket. Because it crosses both the hip and the knee, it is a two-joint muscle. It straightens the knee and helps the psoas and the other hip flexors lift the thigh. That is why the front of your thigh works hard when you hold a leg lifted in front of you.

Vastus lateralis

The largest of the four. It starts on the outer side of the upper femur, at the greater trochanter and along a ridge at the back of the bone, and forms the outer side of the thigh.

Vastus medialis

The vastus medialis lies on the inner side of the thigh and gives it the teardrop shape above the knee. Its lowest fibres pull the kneecap inward, which is why physiotherapists pay attention to it with pain at the front of the knee.

Vastus intermedius

The deepest head. It lies under the rectus femoris, between the other two vasti, and starts on the front and outer side of the femur shaft. You cannot see it or feel it on its own.

The three vasti cross only the knee. That detail decides how you stretch them, as you will see below.

Quads and hamstrings

The quads and the hamstrings sit on opposite sides of the thigh and work as a pair. The quads straighten the knee (knee extension). The hamstrings bend it (knee flexion) and extend the hip. When one side shortens, the other has to lengthen.

In a standing forward fold, teachers often cue you to lift the kneecaps, which means contracting the quads. The idea is that when the quads work, the nervous system lets the hamstrings relax a little, so they stretch more easily. This is called reciprocal inhibition. Both muscles also work at the same time in many standing poses, which keeps the knee stable. That is co-contraction.

How to stretch the quads in yoga

Which pose stretches which head depends on the hip.

• The three vasti lengthen when you bend the knee fully. The hip position does not matter to them.
• The rectus femoris lengthens when you bend the knee and extend the hip at the same time, so the thigh goes back behind you. With the hip flexed, it goes slack.

Balasana (Child's Pose) bends the knees fully with the hips flexed. It stretches the vasti and leaves the rectus femoris slack. If your knees do not bend that far, put a folded blanket between the backs of your thighs and your calves.

For the rectus femoris you need the thigh behind you:

• Anjaneyasana (Low Lunge) with the back knee down. Bend the back knee and hold the foot, or loop a strap around it, and draw the heel toward your seat. Keep the tailbone heavy so the lower back does not arch.
• Ardha Bhekasana (Half Frog Pose): lying on the belly, one knee bent and the hand pressing that foot toward the hip.
• Natarajasana (Dancer's Pose): the standing version of the same shape, the back foot held behind you.
• Dhanurasana (Bow Pose): both knees bent, both hips extended.
• Ustrasana (Camel Pose): the hips move forward over the knees and the whole front of the thigh opens.
• The back leg in Eka Pada Rajakapotasana (One-Legged King Pigeon), when you bend that knee and reach for the foot.
• Supta Virasana (Reclining Hero Pose). Deep for the knees. Lie back onto a bolster and stop if you feel anything in the knee joint itself.

A stretch in the thigh should feel like a pull in the muscle. As you hold it, the sensation should stay the same or fade. If it grows, or you feel it in the knee instead of the thigh, back off. Hold for five to ten slow breaths.

Yoga poses to strengthen the quads

Every pose where you hold weight on a bent knee works the quads. They hold you up and stop the knee from folding.

• Utkatasana (Chair Pose): both knees bent, weight in the heels. Standing up from it works the quads as much as the hold.
• Virabhadrasana I (Warrior I) and Virabhadrasana II (Warrior II): the front knee bent over the ankle.
• Utthita Parsvakonasana (Extended Side Angle) and high lunges: the same front-leg work with a longer hold.

You can also slow a movement down. From a high lunge, lower the back knee to the floor over three or four counts. The quads work while they lengthen, called eccentric work. Then press up and straighten both legs, the concentric part. Repeat eight to ten times on each side, and stop when you lose control of the lowering.

Eccentric work leaves more muscle soreness the next day than holding a pose. Start with a few rounds.

Where sources disagree

Does engaging the quads help the hamstrings stretch? The cue is old and useful: a working quad keeps the knee straight and steady in a forward fold. Reciprocal inhibition is a real reflex. How much it adds to a yoga stretch is less clear. Studies on flexibility point to stretch tolerance, the nervous system accepting a longer muscle, as the main reason range of motion improves with practice. The old version of this post said the hamstrings contract while they stretch in a fold, which is the opposite of what the cue is meant to do.

Contracting a muscle before you stretch it. Contract-relax stretching (from PNF, proprioceptive neuromuscular facilitation) gives similar or slightly larger short-term gains than holding a passive stretch, in several studies. You can use it in a low lunge: press the back knee down into the mat for five breaths, release, then sink a little deeper.

Fascia. You will read that yoga releases the fascia around tight quads. The quads are wrapped in fascia, like every muscle, and the thick band on the outer thigh (the fascia lata and iliotibial band) is part of it. Whether stretching changes fascia itself, or mostly changes how the nervous system reads the stretch, is an open question. Read more in fascia and yoga.

Tight quads and the knee. Tight quads are often blamed for knee pain. The evidence is stronger for the other direction: strengthening the quads and the hip muscles is a first-line treatment for pain at the front of the knee. For runners and cyclists, strength is at least as useful as stretching, see yoga for runners. Knee pain that stays needs a physiotherapist, not a deeper stretch.

Further reading: David Keil, The Quadriceps Muscles, Yoganatomy (2014).

For a full session on the front of the legs, try Legs of Steel, a 45-minute lower body flow, or the Low Lunge class, 25 minutes of Hatha for the hips and hip flexors.

Frequently asked questions

What yoga poses stretch the quads?

Child's Pose, Low Lunge with the back foot held, Dancer's Pose, Bow Pose, Camel Pose, King Pigeon with the back knee bent and Reclining Hero Pose. Child's Pose reaches the three vasti. The poses with the thigh behind you also reach the rectus femoris.

What is the best stretch for your quads?

A low lunge with the back knee on the floor and the back foot drawn toward your seat. It bends the knee and extends the hip at the same time, so it stretches all four heads, and you control the depth with your hand or a strap.

What are the four quad muscles?

Rectus femoris, vastus lateralis, vastus medialis and vastus intermedius. All four join in the quadriceps tendon at the kneecap and straighten the knee. Only the rectus femoris crosses the hip as well.

What are the four exercises for quads?

Squats, lunges, step-ups and leg extensions are the usual gym answer. In yoga the matching poses are Chair Pose for the squat, Warrior I, Warrior II and high lunges for the lunge, and slow lowering from a high lunge for eccentric work.

Why are my quads tight?

Running, cycling and long hours of sitting all keep the knee and hip in a small range. The muscle adapts to what you do. Feeling tight is also a sensation, so a quad can feel tight without being short. Regular stretching and full-range strength work both help.

Is Child's Pose a quad stretch?

Yes, for the vasti. The knees bend fully, which lengthens the three vasti. The hips are flexed, so the rectus femoris stays slack. For the whole front of the thigh, add a pose with the hip extended, such as a low lunge.

Does yoga strengthen the quads?

Yes. Chair Pose, the warrior poses and lunges hold your body weight on a bent knee, which works the quads. Longer holds and slow lowering build more strength than moving quickly through the poses.