Muscles Back of Leg: A Plain Guide to Each One

The muscles at the back of the leg run from your pelvis to your heel, and they help you walk, stand up and bend forward. Most people only think about them when they feel tight. They are a long team, though, and each member has its own job. As a Feldenkrais® teacher, I value anatomy most when it lets you sense your own body. This tour keeps the names simple and the pictures clear.

A quick map of the muscles back of leg

Picture the back of your leg in four zones. At the top sits the big muscle of the buttock. Below it, the hamstrings run down the back of the thigh. Behind the knee lies a small, busy muscle. Below the knee, the calf muscles run down to your heel.

Gluteus maximus: the top of the chain

The gluteus maximus is the largest muscle of the buttock. It starts on the back of the pelvis and the base of the spine. It ends on the thigh bone and a broad band of tissue along the outside of the thigh.

Its main job is to straighten the hip. You use it when you climb stairs, rise from a chair, or push off to walk uphill. On flat ground it works more quietly. Many people find it switches on less than they expect, and the hamstrings then pick up some of the effort.

The three hamstrings

The hamstrings are three muscles on the back of the thigh. They begin at the sitting bone, the bony point you feel when you sit on a hard bench. The one exception is the short part of the biceps femoris, which starts on the thigh bone. They end just below the knee.

• Biceps femoris. This one runs on the outer side of the back of the thigh. It ends on the outer side of the lower leg. It helps bend the knee and turn the lower leg slightly outward.
• Semitendinosus. This muscle lies on the inner side, partly over the third one. It has a long, thin tendon that you can sometimes feel behind the knee. It bends the knee and helps turn the lower leg inward.
• Semimembranosus. The deepest of the three sits on the inner side. It ends on the inner side of the shin bone. It also bends the knee and helps straighten the hip.

Together, the hamstrings do two things. They bend the knee, and they help the hip move back. They also slow your leg down at the end of each swing when you walk, so your foot does not shoot too far forward. When you lean forward from the hips, they lengthen and share the job of lowering you slowly.

Behind the knee and into the calf

Right behind the knee lies the popliteus, a small, flat muscle. It helps unlock the knee when you start to bend it from standing.

The calf has two main muscles. The gastrocnemius is the larger one, with two parts that you can see as a rounded bulge. It starts just above the knee, so it crosses both the knee and the ankle. The soleus lies underneath and starts just below the knee. Both join into the Achilles tendon, the thick cord that attaches to the heel.

The calf pushes you up onto your toes. It also keeps you steady while you stand, because your body sways slightly all the time. Small, constant adjustments in the soleus are part of how you stay upright without thinking.

How the back of the leg connects to the pelvis and lower back

The hamstrings start on the sitting bone, which is part of your pelvis. So when the hamstrings pull, they can influence how the pelvis tilts. The glutes also attach to the pelvis and the base of the spine. The lower back muscles join the same region from above.

This is why tight hamstrings and a rounded low back are often talked about together. When the pelvis tips backward as you bend, the low back tends to round. When the pelvis rolls forward over the thighs, the hips do more of the bending.

I would not say one causes the other. The picture is more like a shared pattern, and it varies from person to person. Our explainer on why hamstrings feel so tight explores some of the reasons.

Muscle tightness is not the same as nerve symptoms

The sciatic nerve is the thickest nerve in the body. It runs down the back of the thigh, close to the hamstrings, and then branches below the knee. That closeness is one reason the two can be confused.

Muscle tightness usually feels like a pulling or aching in the muscle itself. Nerve symptoms can feel different: tingling, numbness, burning or a shooting pain, sometimes below the knee. I cannot tell you which one you have, and I would not try. A doctor or physiotherapist can help you sort that out. Our guide on sciatic nerve pain or hamstring lays out the usual differences, and the Feldypedia article on sciatica and nerve related back pain gives the wider picture.

It also helps to know that real muscle strains are a separate matter. Mild hamstring injuries usually improve within a few days, while severe ones can take weeks or months to heal (NHS, 2025). A sudden sharp pain at the back of the thigh is worth having looked at.

A small experiment: how does the back of your leg take part?

Sit near the edge of a chair, feet resting on the floor. Place your hands on your thighs. Slowly let your upper body tip forward a little, as if to look at your shoes. Stop well before it feels like effort.

Notice what moves. Does your low back round first? Do your sitting bones roll back on the seat? Do you feel any change in the back of your thighs? Now come back up and try again. This time, imagine your hip joints, where the thigh meets the pelvis, as the place that folds. Let the pelvis roll forward a little, so the sitting bones slide back and apart.

Compare the two. Which way felt easier? Where did you feel the back of the leg? You do not need to get anywhere. You are only noticing.

How a Feldenkrais approach works with the back of the leg

Many tips about the muscles at the back of the leg tell you to stretch them. A stretch has its place. In Awareness Through Movement®, the question changes: how does the back of the leg take part when you bend, and what else is helping or not helping?

In practice, lessons are slow and small, often lying down. You might bend one knee and sense how the foot, the heel and the pelvis respond. You might roll the pelvis slightly and notice the back of the thigh. Many people find that a leg which felt short and tight begins to feel longer, even though nobody pulled on it.

If you would like to start with the lower back itself, the lesson on how to relax your back is a gentle first step. Feldy gives you a 7 day free trial of short audio lessons for your living room.

Where doctors, physios and other methods fit

Care from your doctor or physiotherapist comes alongside this work and never gets replaced by it. If you have a diagnosed injury or nerve problem, follow the advice of the people looking after you.

Other methods take a different route. Static stretching works on the length of a muscle. Strength training builds the capacity of the glutes and hamstrings. Yoga and Pilates are different routes again, and each can be helpful. A Feldenkrais lesson adds a different angle: sensing and sorting out how you organise the whole movement. If you are curious which method suits you, the lower back pain page is a good place to begin.

Common Questions about the muscles back of leg (FAQ)

Is it safe to move the muscles at the back of my leg when they feel tight?

With everyday tightness, easy and slow movement is usually fine. Keep it small, and stop if anything turns sharp. Be more careful if you have a sudden tear type pain, bruising, or tingling that runs down the leg. In those cases, have it checked before you practise at home.

How often should I explore the back of my leg gently?

Little and often suits this area. Five minutes on most days beats one long weekly session. Short, easy sessions let your nervous system notice small changes. You can also pause during long sitting to shift your weight and feel your legs on the chair.

How long until the back of my leg feels different?

Some people feel a little more ease after one session, though it can fade by evening. Lasting change usually needs some weeks of calm, regular practice. Old habits take longer, and that is normal. If nothing changes after several weeks, talk to a clinician.

How is this different from static hamstring stretching?

A static stretch pulls on one muscle and holds it. A Feldenkrais approach asks how your pelvis, spine, knees and feet share the work when you bend. You move slowly and notice, instead of pulling. Both can feel good, and many people enjoy using them side by side.

When should I see a professional about pain in the back of my leg?

See a doctor or physiotherapist if the pain began suddenly, if you heard or felt a pop, or if you see bruising. Get checked too if you notice numbness, tingling, shooting pain or weakness in the leg. A swollen, warm, painful calf also needs prompt medical attention.

What are the best muscles to focus on for a tight back of the leg?

There is no single best muscle. The hamstrings get most of the attention, but the glutes and calves share the same chain. Exploring how the whole back of the leg joins in when you bend often tells you more than working on one muscle alone.

Are tight hamstrings the same as sciatic nerve pain?

No. Muscle tightness usually feels like a pull or ache in the muscle. Nerve symptoms often feel like tingling, burning, numbness or shooting pain, sometimes below the knee. They can look alike, so a clinician can help you tell them apart.