Knee strengthening exercises are one of the best ways
to cure knee pain and stop it from coming back.
People who do knee strengthening exercises have less pain, recover
quicker from injuries, function better and have less recurrences of pain.
is weakness in the leg muscles, it means the knee joint is less well
supported, resulting in more weight going through the bones and making knee problems much more likely. Knee strengthening exercises help to combat that1.
All the exercises here are easy to perform, quick, effective and suitable for most people, whether you are looking for knee strengthening exercises for runners, after an injury, with arthritis or almost any knee problem.
Why Do Knee Strengthening Exercises?
Knee strengthening exercises help to improve both the strength and control around the knee which is really important:
For knee stability & control
To ensure correct biomechanics in the feet, knee, hips and back
To reduce the risk of injury
To allow full, pain-free movement
To ensure full function
There are so many different knee strengthening exercises out there, it can be hard to know where to start. You will find a whole range of exercises here that will work all of the different muscle groups. Pick and choose three or four exercises that feel right for you - they should be challenging but not painful.
If you are looking for knee strengthening exercises after an injury or surgery, or you've never done exercises before, these are a good place to start. Once you feel confident with these, move on to the
knee strengthening exercise sections.
1. Quad Clenches
The first of our knee strengthening exercises helps maintain and strengthen the quads muscles without moving the knee and helps enable full straightening of the knee.
Lie flat on your back or sitting up. Leg and knee straight
Tighten the muscle on the front of the thigh by
pushing your knee down. You should feel your thigh muscles clench.
Hold for 3 secs.
Repeat 10-20x every 3-4 hours
If you are struggling to get your
knee to straighten fully, place a rolled up towel underneath the ankle
so that your leg is lifted slightly on the bed. Then do the exercise as
described. Lifting the knee up slightly lets gravity help the knee to
2. Short Arcs
The Short Arcs knee exercise helps to strengthen the quads muscles without requiring much knee movement and improve control.
Lie flat on your back or
sitting up with your leg horizontal on a flat surface such as a bed.
Place a rolled up towel (approx 10cm diameter) under the knee
Pull your toes towards you and clench
you thigh muscles. Slowly lift your foot up off the bed until your knee
is straight (keep your knee resting on the towel). Hold for 3-5 secs
and slowly lower
repeat 10-20 times, 3x daily
You can challenge yourself further by a. Increasing the size of the towel under the knee
2) b. Add a weight e.g. by wearing a shoe, or using a light ankle weight c. Progress further by using a heavier weight.
3. Straight Leg Raise
This knee strengthening exercise works to strengthen the quads without needing to bend the knee. NB Do not do this if you have a history of back problems.
Lie flat on your back. Leg and knee to be worked straight, other leg bent
Pull your toes towards you and
tighten/clench the muscle on the front of the thigh, locking your knee
straight. Lift your foot up about 6 inches off the bed. Hold for 3-5
secs and slowly lower
Ensure your knee stays straight the whole time
Repeat 10-20 times, 2x daily
To work harder, add a weight e.g. by wearing a shoe.
4. Buttock Kicks
Buttock kicks are another great exercise to strengthen the hamstrings without any weight going through the knee joint. It also helps increase knee mobility (flexion) and aids circulation.
Lie on your tummy (on the floor or bed) with your legs straight
Lift your foot off the floor and bring it towards your bottom as far as you can. Slowly return to the starting position
Repeat 10-25x, 3x daily
You are aiming to get your heel all the way to your bottom
Make the exercise easier by hooking your good leg underneath the bad and using it to help lift the bad leg up
Make the exercise harder by using a weight e.g. a shoe or ankle weight.
5. The Clam: Stage 1
The Clam is one of my absolute favourite knee strengthening exercises. It helps to strengthen the glutes to support the
knee and prevent excessive weight going through the inner side of the
knee – a must for anyone with knee pain!
Lie on your side with your hip and knees bent approx 90°, feet together
Keeping your feet together, lift the top knee up as high as you can. Hold for 3 seconds and slowly lower
Repeat 10-25x on each side, 2x daily
For more of a challenge, squeeze your heels together while doing the exercise to work the glutes harder
Do not let your top hip roll backwards.
6. The Bridge: Stage 1
The Bridge is one of those excellent knee strengthening exercises that works both the hamstrings, quads and buttock muscles. 3 for the price of 1!
Lie on your back with both knees bent about 90° and your feet on the floor/bed
Clench your buttocks and lift your
bottom off the bed as high as you can without arching your back. Hold
for 3-5 seconds and slowly lower
Repeat 10-25 times, 1-2x daily
Keep your back straight – don’t let it
arch as you lift up, it should be your bottom doing the work
hold your breath – keep breathing normally.
7. Hamstrings Clenches
Hamstring Clenches help to strengthen the hamstrings muscles without having to move the knee - again making them perfect after a knee injury or surgery.
Sit in a chair with your heel against the leg of the chair and your feet firmly on the floor
Press your heel firmly backwards into the chair leg feeling the back of your thigh tightening/clenching. Hold for 3-5 secs
Repeat 10-20x, 2x daily
NB The foot shouldn’t move during this knee exercise.
8. Long Arcs
Long arcs helps to strengthen the quads, increase knee mobility and is great to do anytime sitting for prolonged periods, 30mins+, to stop the
knee from getting stiff.
Sit on a firm chair with your knee bent and your foot on the floor
Lift your foot up and straighten your knee as much as possible. Hold for 3-5 secs and slowly lower
Repeat 5-20 times, 3x daily
Strengthen further by adding an ankle weight.
9. Buttock Clenches
Buttock clenches are the perfect place to start if you want to strengthen your glutes.
Start lying down or sitting up
Clench your buttocks together as tightly as you can and hold for 3 seconds. You should feel yourself rise up from the chair slightly
Repeat 10-20x every 3-4 hours
If you find this uncomfortable, try doing this knee exercise lying down, either with your legs out straight or your knees bent.
10. Knee Marching
Knee Marching is one of those knee strengthening exercises that works the quads without having to put any weight through the knee joint, making it perfect in the early stages of recovery from a knee injury or surgery.
Sit in a chair with your feet on the floor
March your legs up and down one at a time. Lift your knee and foot up and then back down
Repeat for about 1 minute, 2x daily and any time you are sitting for more than 20 minutes to stop your knee getting stiff
Progress knee strengthening exercises by adding an ankle weight or shoe.
11. Kick Backs
The Kick Backs knee exercise helps to improve both the strength of hamstrings and the mobility of the knee.
Stand up straight holding on to something stable e.g. chair or table
Lift your foot up as far as you can towards your bottom, bending the knee. Hold for 3-5 secs
Repeat 5-25 times, 2x daily
For more challenge, add a weight e.g. shoe or ankle weight
Don’t bend forwards - keep your body upright
Keep your knees in line with each other- don’t let your thigh come forwards.
12. Heel Raises
Heel Raises help to strengthen the calf muscles found on the back of the lower leg and particularly helps with walking and running. The calves move and control the foot and ankle, help support the knee and aid balance when standing on tip toes so should always been included with knee strengthening exercises.
Stand with your feet slightly apart,
weight equally distributed, holding onto something solid for balance if needed such as a chair or the wall
Rise up onto your toes lifting your heels
as high as possible. Keep your body upright as you do this, don’t bend forwards.
Hold for 3-5 secs and slowly lower
Repeat 10-30 times, 2x daily
Try and push up equally through each leg.
13. Sit to Stand
Sit To Stand is another one of my favourite knee strengthening exercises! Whilst it might sound simple, this exercise helps to improve knee mobility, strengthens the quads, hamstring and glutes all at the same time, and improves general fitness and knee function.
I love knee strengthening exercises that work two or three muscle groups at the same time - it's like buy one get one (or two) free!
Sit in a firm chair, feet on the floor
Lean forwards, lift your bottom and stand up straight and then sit back down
You can make this exercise easier by: a. pushing up through your arms too b. The higher the chair, the easier the exercise
You can make this exercise harder by: a. Not using your arms b. Using a lower chair c. Increasing the speed you do knee strengthening exercises at
d. Hold a heavy weight – e.g. bag of books during this knee exercise.
14. One Leg Standing: Stage 1
Balance and stability are often affect by knee pain so it is really important to work on regaining both to ensure good control at the knee and help preventing further knee injuries.
A quick way to tell whether you should be doing balance exercises as part of your knee strengthening exercises program is to try standing on one leg with your eyes closed. If you can’t do it for one
minute, you should do some balance exercises.
Stand near a wall or chair for support
Lift up your good leg and stand on one leg for as long as you can. It is normal to wobble a bit
Spend 5 minutes doing this 2x daily e.g. when brushing your teeth
To work harder, close your eyes and perform the exercise as above - you'll be surprised how much harder it is. Or try Stage 2.
How Much Should I Do
As your muscles get stronger, you will be able to increase the number
of repetitions of each of these knee strengthening exercises.
You will probably need to do knee
strengthening exercises at least four times a week for about a month before you
notice much change in your knee pain at which point you may also want to add in some knee stretches - it's important to have enough strength before you start stretching else you can make things worse.
Here we have looked at a range of knee strengthening exercises that work all of the different muscle groups working around the knee. If you would prefer to focus on one muscle group at a time, choose from these knee strengthening exercise programs.
Quads Strengthening Exercises The quadriceps are the muscles at the front of the thigh that straighten the knee. Strong quads are important for getting up from a chair, going upstairs, walking & running. Weak quads are one of the most common causes of knee pain.
Hamstring Strengthening Exercises The hamstrings are the muscles on the back of the thigh that bend the knee. You need a good combination of strength and length in these muscles. The hamstrings are particularly important for running and twisting the knee.
Glute Strengthening Exercises Weak glutes are one of the most common contributors to knee pain. The glutes are the buttock muscles, and they play a vital role in ensuring the forces go through the knee evenly but are often forgotten about in knee strengthening exercises. Virtually everyone who suffers from knee pain has weak glutes, so they are well worth doing. Indeed studies have shown that strengthening glute medius reduces pain and improves functional recovery following knee surgery2.
Vastus Medialis Strengthening The vastus medialis muscles controls how the kneecap moves and is really important for knee stability and control. The muscle has to be worked in a different way to the other knee strengthening exercises.
Ready For More Of A Challenge?
Once you've mastered these knee strengthening exercises, you can move on to the next stage:
And don't forget, muscles need good length as well as strength. People get most benefit from knee strengthening exercises when they are done along knee stretches.
Safety Advice: Remember, you should always check with your doctor before starting a new exercise program, particularly if you have injured your knee, to ensure these knee strengthening exercises are safe to do.
Check Out Our New Book!
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Page Last Updated: 11/03/21 Next Review Due: 11/03/23