Runner's Knee (Patellofemoral Pain): Exercises That Help

For runner's knee — known in medicine as patellofemoral pain syndrome — the most effective, evidence-backed treatment is exercise; specifically, a program that strengthens the muscles around both the hip and the knee has been shown to reduce pain and improve everyday activity ^[4]. The good news is that most of these exercises need no special equipment, can be done at home, and start to make a difference within a few weeks when they are set up correctly. This guide explains why pain develops at the front of the knee, which exercises actually work, how to perform them step by step, in what order and how often, and when you should see a professional instead of pushing through.

If you want the bigger picture, our pages on patellofemoral pain syndrome and on knee pain complement this article well.

What is runner's knee (patellofemoral pain)?

"Runner's knee" is the everyday name for patellofemoral pain syndrome — a common condition in which pain is felt at the front of and around the kneecap (patella). The name can be misleading, because it is not limited to runners. A dull ache at the front of the knee that gets worse with climbing or descending stairs, sitting for long periods (at the cinema or in a car), squatting, kneeling, and walking on slopes is typical ^[6].

The pain usually does not come from a single sudden injury. Instead, it tends to build up when the knee is loaded more than it can comfortably handle. The patella is a bone that glides up and down inside a groove at the bottom of the thigh bone as the knee bends. When muscle balance, movement patterns (biomechanics) and loading are disrupted, the way the patella tracks in this groove — and the contact pressure behind the kneecap — changes, and pain can appear ^[6]. That is why treatment focuses not on "fixing" one muscle, but on strengthening the alignment created together by the hip, thigh and trunk.

An important point: in patellofemoral pain syndrome, imaging often shows no structural damage. The pain is real, but it does not mean the knee is "worn out." This is reassuring, because it means the condition is usually well managed with sensible loading and strengthening.

Does exercise really work for runner's knee?

Yes. A large Cochrane systematic review reported that exercise therapy can reduce pain and may improve function in both the short and longer term for people with patellofemoral pain ^[4]. An international expert consensus published in 2018 likewise describes exercise therapy as the recommended first-line approach for managing patellofemoral pain ^[5].

The crucial detail is which exercises are combined. A meta-analysis published in JOSPT found that strengthening the hip and knee muscles together is more effective than strengthening the knee (quadriceps) alone for reducing pain and improving activity ^[3]. There is a logical reason: when the muscles that stabilise the hip are weak, the thigh tends to rotate inward and drift sideways during walking and running, which can increase pressure on the kneecap ^[3]. Strengthening the hip directly targets this "alignment problem" above the knee.

A realistic expectation: NHS resources note that it often takes around 6-8 weeks of specific exercises to notice a difference in knee pain, and a further couple of months before you feel fully better ^[1]. In other words, patience and consistency are far more valuable than searching for a single "miracle move."

What should I check before starting?

To get the most from these exercises — and to avoid making things worse — a few basic rules apply ^[2]:

• ·Let pain be your compass. Exercises should challenge your muscles but stay relatively pain-free. Picture a 0-10 scale (0 = no pain, 10 = very severe). During exercise, pain should not exceed 3/10; if it does, reduce the repetitions or the difficulty ^[2].
• ·With severe pain, start with the hips. If front-of-knee pain is marked, it is sensible to do only the hip exercises for the first couple of weeks and add the knee exercises once the pain has eased ^[2].
• ·Quality matters more than quantity. Move slowly and in a controlled way; avoid sudden movements. Do not let your knee collapse inward or drift outward, and keep your trunk stable ^[2].
• ·Stop if the joint is inflamed. If your knee is swollen, warm and painful even at rest, do not do strengthening exercises; it should be assessed first ^[2].
• ·Use suitable shoes and surface. Sturdy, cushioned, non-slip athletic shoes and comfortable clothing improve movement quality ^[2].

The program below is a general framework; it works best when adapted to your own situation (pain level, fitness, previous surgery or diagnosis). A physiotherapist can make those adjustments in person and assess how you move.

Which exercises strengthen the hips? (Step by step)

The first goal of the program is to strengthen the hip muscles — especially the abductors and external rotators — that control alignment above the knee. Perform each movement slowly and with control.

1. ·Side-lying leg raises. Lie on your side on a mat with your legs straight. Rest your head on your lower arm and place your other hand on the floor in front of your belly to stabilise your trunk. Keeping your top leg straight, slowly lift it toward the ceiling, hold briefly, then lower it under control. Do 10-20 repetitions on each side, 3 sets total. Your trunk should not move — only your leg works. For more challenge, place an elastic band just above your knees ^[2].
2. ·Side-lying clam exercise. Lie on your side with your trunk straight. Bend both knees to 90 degrees and stack your feet together. Without rotating your trunk, slowly lift your top knee while keeping your feet touching, then lower it. Only open as far as you can without your body moving. Do 10-20 repetitions on each side, 3 sets total. Leaning your back against a wall helps stop your pelvis from rotating. This works the hip abductors and external rotators ^[2].

These two movements form the basis of the hip strengthening highlighted in the JOSPT meta-analysis, and are worth prioritising in the early weeks of the program ^[3].

Which exercises strengthen the quadriceps? (Step by step)

As pain allows, add movements that strengthen the quadriceps — the muscle at the front of the thigh that supports the kneecap. The order below starts with low pressure on the knee and gradually increases it.

3. ·Straight leg raises (lying on your back). Lie on your back. Bend your good leg to 90 degrees with the foot flat on the floor. Keeping the painful leg straight, tighten the front thigh muscle and lift your heel about 30 cm off the floor (around a 45-degree angle), hold for 5 seconds, then lower slowly. Do 10-20 repetitions on each side, 3 sets total. Control the lowering phase in particular and keep your lower back flat on the floor ^[2].
4. ·Seated knee extensions (leg lifts). Sit on a chair high enough to bend your knees to 90 degrees. Slowly straighten one leg in front of you and lift it, then lower it slowly over about 5 seconds. Do 10-20 repetitions on each side, 3 sets total. If you wish, add a light, pain-free ankle weight ^[2].
5. ·Wall sit. Stand with your back flat against a wall. Place your feet about 60 cm from the wall, shoulder-width apart. Slide your back down the wall until your thighs are roughly parallel to the floor (about 90 degrees). Keep your kneecaps facing forward and your back against the wall. Hold for 20-30 seconds at first, gradually building up to a minute by adding 5-10 seconds at a time. Repeat 3 times, standing up and resting 30 seconds between holds ^[2].
6. ·Squats. Stand with your feet shoulder-width apart and your toes pointed slightly outward. Push your hips back (as if sitting on a chair) and slowly bend your knees, then straighten again. Keep your centre of gravity over your knee joints and your back straight. Start with quarter squats (about 45 degrees); if pain-free, progress to half squats (thighs near parallel to the floor). Do 10-20 repetitions, 3 sets total, resting 30-60 seconds between sets ^[2].
7. ·Step-ups. Stand in front of a stable step or bench. Place one foot on it and straighten that leg to step up, lifting your other thigh until it is parallel to the floor, then step down under control. Do 10-20 repetitions on each side, 3 sets total. Step-ups can load the knee heavily; if they hurt, use a lower step or postpone this movement ^[2].

What about stretching and flexibility?

Alongside strengthening, maintaining flexibility in the thigh and calf muscles is part of managing patellofemoral pain; expert resources list flexibility work as a complementary component of the program ^[6]. Perform the stretches below slowly, without bouncing, until you feel a mild stretch, and hold for 20-30 seconds.

8. ·Quadriceps (front thigh) stretch. Standing, hold a wall or chair for balance. Grasp the ankle of the painful side and draw your heel toward your buttock; keep your knees side by side and avoid arching your back. Hold for 20-30 seconds once you feel a gentle stretch, and repeat 2-3 times.
9. ·Hamstring (back thigh) stretch. Lie on your back and raise one leg straight up (loop a towel or band behind the thigh and pull gently if needed). The knee can stay slightly bent. Hold until you feel a stretch behind the thigh for 20-30 seconds, 2-3 repetitions.
10. ·Calf (gastrocnemius) stretch. Facing a wall, step one leg back with the heel on the floor and bend your front knee slightly. Lean forward until you feel a stretch in the back calf, hold for 20-30 seconds, and repeat 2-3 times on each side.

Stretching does not replace strengthening; the two work better together. Hip and quadriceps strengthening remain the foundation of the program ^[3].

How often and in what order should I do these?

A general framework can be summarised as follows:

• ·Frequency. NHS resources suggest doing the exercises several times a week (often every other day or regularly) and continuing the program for about 12 weeks ^[1]. InformedHealth.org similarly recommends working out ideally every two days ^[2].
• ·Order. If front-of-knee pain is marked, start with the hip movements (exercises 1-2); add the quadriceps movements (3-7) as the pain eases ^[2]. This staged approach also aligns with clinical findings that favour starting with hip strengthening ^[3].
• ·Progression. Build repetitions gradually from 10 toward 20; once a movement feels easy, increase the challenge with an elastic band or a light weight ^[2].
• ·Activity modification. Rather than stopping pain-provoking activities entirely (such as your running distance), temporarily reducing them is one of the approaches recommended by expert resources ^[5].

Remember: the repetition count is a guide, not a target. As long as you can perform the movement well, you can adapt the number of sets and repetitions to your own situation ^[2].

When should I see a professional?

Exercises help many people, but in some situations you should be assessed by a doctor or physiotherapist first. Seek professional advice before continuing to exercise if:

• ·The knee is swollen, red, warm, or clearly painful at rest ^[2].
• ·You feel locking, giving way (a sudden loss of strength), or marked instability in the knee.
• ·The pain started suddenly after a fall, twist or direct blow.
• ·The pain is not improving within a few weeks despite exercise, or it is getting worse ^[1].
• ·You have additional symptoms such as fever, unexplained weight loss, or night pain.
• ·You have had previous knee surgery or a diagnosed joint or rheumatological condition.

A physiotherapist can confirm whether your pain is truly patellofemoral, tailor the exercises to you, and assess your movement patterns (for example, your running technique). Expert resources explicitly recommend consulting a physiotherapist or doctor to build the right program for you ^[2].

Quick Summary

• ·"Runner's knee" is the everyday name for patellofemoral pain syndrome, pain around the kneecap; it is not limited to runners ^[6].
• ·The most effective evidence-based approach is exercise; a Cochrane review reports that exercise can reduce pain ^[4].
• ·Doing hip and knee strengthening together is more effective than knee strengthening alone ^[3].
• ·With severe pain, start with the hips, then add quadriceps exercises as the pain eases ^[2].
• ·During exercise, pain should not exceed 3/10, and movements should be slow and controlled ^[2].
• ·It usually takes 6-8 weeks to notice a difference and a few more months to feel fully better; the program is continued for about 12 weeks ^[1].
• ·See a professional for swelling, locking, rest pain, or symptoms that do not improve ^[2].

Frequently Asked Questions

How long do runner's knee exercises take to work?

NHS resources note that it usually takes around 6-8 weeks of specific strengthening exercises to notice a difference in knee pain, and a further couple of months before you feel fully better; this is why the program is typically continued for about 12 weeks ^[1]. Consistency and good technique matter more than speed.

Should I keep exercising while I have pain?

Exercises should challenge your muscles but stay relatively pain-free. Aim to keep pain at or below 3/10 on a 0-10 scale; if it goes higher, reduce the repetitions or the difficulty ^[2]. However, if the knee is swollen, warm and painful even at rest, do not do strengthening exercises and get it assessed first ^[2].

Are hip exercises or knee exercises more important?

Both matter, but they work best together. A meta-analysis published in JOSPT showed that strengthening the hip and knee muscles together is more effective than strengthening the knee alone ^[3]. If front-of-knee pain is marked, it is recommended to start the program with hip movements ^[2].

Is runner's knee only seen in runners?

No. Although the name "runner's knee" is common, patellofemoral pain can also appear during everyday activities such as climbing stairs, sitting for long periods, squatting and kneeling, and it affects people who do not run ^[6]. For more detail, see our page on patellofemoral pain syndrome.

Can I do these exercises at home without equipment?

You can do most of them at home with no special equipment. Side-lying leg raises, the clam, straight leg raises, wall sits and squats need only a mat and a wall ^[2]. As you progress, you can add an elastic band or a light ankle weight to increase the challenge ^[2].

When can I return to running?

This varies from person to person, and there is no single fixed date. Expert resources recommend temporarily reducing pain-provoking activities rather than stopping them entirely, and increasing them gradually ^[5]. Support from a physiotherapist to review your running technique and loading plan can make a safe return easier ^[5].

What should I do if exercises increase my pain?

If pain exceeds 3/10, reduce the repetitions, lower the difficulty of the movement, or ease back that day's session ^[2]. If pain is not improving after a few weeks of regular work, or it is increasing, see a professional to have the program tailored to you ^[1]. In that case it can also help to review other possible causes on our knee pain page.

Should I use a kneecap tape or brace?

Taping and bracing may offer some short-term relief for certain people as an addition to exercise, and they are considered among the complementary options in expert reports ^[5]. However, they do not replace exercise; the core treatment is strengthening and activity modification ^[5]. Whether to use them is best decided together with a physiotherapist.