Your knees work with every step, every climb up the stairs and every time you get up from a chair, so it is no wonder that many people wonder how to strengthen their knee joints and how to move without overloading them. There is no single method that will "fix" your knees - but there are plenty of sensible everyday choices: regular moderate-intensity movement, strengthening the thigh and hip muscles, managing body weight and gradually increasing loads. In this article we describe which activities are considered knee-friendly, present a set of simple strengthening exercises step by step (with a table) and explain when you need to see a doctor about knee problems.
This article is for informational purposes only and does not replace medical advice. If you have symptoms, consult a doctor.
How is the knee joint built and what loads it?
The knee joint connects the thigh bone (femur) with the shin bone (tibia), with the kneecap at the front. The bone surfaces are covered with articular cartilage, the menisci lie between them, and the whole joint is stabilized by ligaments (including the cruciate and collateral ligaments) and muscles. Especially important are the quadriceps at the front of the thigh, the hamstrings at the back of the thigh, and the hip and glute muscles, which affect how the knee is aligned when walking and squatting.
The main things that load the knee are:
- sudden changes in intensity - e.g. running after a long break, an intense weekend of skiing without preparation,
- jumps, sudden stops and changes of direction - typical of team sports,
- long periods of kneeling and deep squats repeated at work or at home,
- excess body weight, which increases the load with every step,
- low activity and weaker muscles that stabilize the joint less well,
- past injuries, e.g. sprains or damage to ligaments or menisci.
Which physical activities are knee-friendly?
Movement is essential - knees usually cope worse with long periods of inactivity than with moderate, regular activity. General guidelines for adults recommend at least 150-300 minutes of moderate activity per week and muscle-strengthening exercises several times a week. When taking care of their knees, people often choose forms of movement that are smooth and low-impact:
- Walking and Nordic walking - easy to dose, preferably on level ground and in comfortable shoes. Poles help you keep a rhythm and engage your arms.
- Cycling - stationary or regular. Saddle height matters: with the pedal at its lowest point, the knee should be only slightly bent.
- Swimming and water exercise - water reduces body weight. Some people feel knee discomfort with breaststroke - in that case it is worth choosing another stroke.
- Elliptical and cross trainers - your feet stay in contact with the pedals the whole time, so the movement is smooth, without a landing phase like in running.
- Yoga, Pilates, general fitness exercise - with an instructor who knows about your limitations and will help modify positions that load the knees.
Training on a FreeStep trainer
One home option is the Teeter FreeStep trainers - recumbent cross trainers (seated steppers). You exercise on them in a reclined seated position, with a backrest, and your legs move along a fixed, repeatable path - without your feet striking the ground as in running. Your arms move the handles at the same time in a push-pull motion. Intensity is adjusted with a dial across 13 levels of magnetic resistance, so it is easy to start very light and gradually increase the load. Important: FreeStep is training equipment, not a medical device - it is not intended for treatment or rehabilitation. If you have knee problems, ask a doctor or physical therapist whether this kind of training is right for you.
How to increase the load?
Knees, like the whole body, need time to get used to new exertion. The general rule: increase time or intensity gradually, e.g. by a few minutes per week, not from one day to the next. Mild muscle fatigue after training is normal. Joint pain that gets worse during exercise, lasts until the next day or is accompanied by swelling is a signal to reduce the load and consult a specialist.
Which exercises strengthen the muscles around the knees?
The exercises below are general examples, commonly found in routines that strengthen the thigh and hip muscles. They are not a treatment or rehabilitation program. Do each one without pain, and if you have knee problems or have had an injury or surgery, consult a doctor or physical therapist first. Start with fewer repetitions and exercise on a stable, non-slip surface.
1. Lying quadriceps sets
- Lie down or sit with your legs straight; you can place a rolled-up towel under your knee.
- Tighten the muscle at the front of your thigh, pressing your knee down into the towel. Point your toes toward you.
- Hold for 5 seconds, relax. 8-10 repetitions per leg.
Do it without pain. If you have any complaints, consult a doctor or physical therapist first.
2. Lying straight leg raise
- Lie on your back, one leg bent with the foot on the floor, the other straight.
- Tighten the thigh muscle of the straight leg and slowly raise it to the height of the bent knee.
- Hold for 2-3 seconds and slowly lower it. 8-10 repetitions per side.
Don't arch your back. Do it without pain, and if you have any complaints, consult a doctor or physical therapist first.
3. Sit-to-stand
- Sit on a stable chair, feet hip-width apart.
- Lean your torso slightly forward and stand up, pushing off with your legs. Keep your knees in line with your feet, not caving inward.
- Slowly sit back down. 8-10 repetitions. At first you can help yourself with your hands.
Do it without pain. If you have any complaints, consult a doctor or physical therapist first.
4. Glute bridge
- Lie on your back, knees bent, feet on the floor hip-width apart.
- Squeeze your glutes and lift your hips until your torso and thighs form a line.
- Hold for 2-3 seconds and slowly lower. 8-10 repetitions.
Do it without pain. If you have any complaints, consult a doctor or physical therapist first.
5. Side-lying leg raise
- Lie on your side, bottom leg slightly bent, top leg straight in line with your torso.
- Slowly raise the top leg by roughly 10-30 centimeters, toes pointing forward, not up.
- Slowly lower it. 8-12 repetitions per side.
This exercise engages the muscles on the side of the hip. Do it without pain, and if you have any complaints, consult a doctor or physical therapist first.
6. Low step-up
- Stand in front of the lowest stair or a stable platform and hold the railing.
- Place one foot on the step and step up, straightening your leg. Keep your knee over your foot.
- Slowly step down with the same leg. 8-10 repetitions per side.
Do it without pain. If you have any complaints, consult a doctor or physical therapist first.
7. Calf raises
- Stand next to a wall or the back of a chair, feet hip-width apart.
- Slowly rise onto your toes, hold for a moment and lower your heels.
- 10-15 repetitions.
This exercise engages the calf muscles. Do it without pain, and if you have any complaints, consult a doctor or physical therapist first.
Knee exercises at a glance - table
| Exercise | Main muscles | Repetitions (approximate) | What to watch out for |
|---|---|---|---|
| Quadriceps sets | front of the thigh | 8-10 x 5 s per leg | calm breathing, no pain in the knee |
| Straight leg raise | front of the thigh, hip flexors | 8-10 per leg | no arching of the back |
| Sit-to-stand | thighs, glutes | 8-10 | knees in line with feet |
| Glute bridge | glutes, back of the thigh | 8-10 | don't overextend the lower back |
| Side-lying leg raise | side hip muscles | 8-12 per side | toes pointing forward |
| Step-up | thighs, glutes | 8-10 per leg | low step, hold the railing |
| Calf raises | calves | 10-15 | support for balance |
Many people do this set 2-3 times a week, with a rest day in between. If a physical therapist has recommended a different set or a different dosage, follow their guidance.
What to avoid if you want to take care of your knees?
- Sudden increases in load - introduce longer routes, heavier weights and new sports gradually.
- Exercising "through the pain" - joint pain is a signal to stop, not to push harder.
- Knees caving inward when squatting, standing up or going down stairs.
- Kneeling for long periods on a hard surface - use a pad and take breaks.
- Worn-out shoes for walking and running.
- Skipping the warm-up - a few minutes of marching or easy pedaling prepares the body for exertion.
Body weight and daily habits
Every kilogram of body weight is transferred to the knees when walking and climbing stairs. For people who are overweight, reducing body weight is often one element of taking care of their joints - a realistic plan is worth discussing with a doctor or dietitian. When it comes to diets and "joint" supplements, don't be guided by advertising. A balanced diet is important for the whole body, and talk to a doctor or pharmacist about any supplementation.
When should you see a doctor about your knee?
Don't delay a consultation if you notice:
- swelling, redness or warmth in the knee, especially with fever,
- pain and swelling after an injury, a pop in the knee at the moment of twisting,
- knee locking (you can't straighten or bend it) or a feeling of the knee "giving way",
- inability to put weight on the leg,
- pain that wakes you at night, gets worse or lasts several weeks,
- calf pain with swelling and redness - this requires urgent assessment.
A doctor will examine your knee, order imaging if needed and may refer you to an orthopedist or physical therapist, who will select exercises individually.
Knees, hips and spine
The body works as a whole - the alignment of the hips and feet affects the knees, and long periods of sitting change the way we move. That is why the set above also includes exercises for the glutes and hips. You can read about daily activity for people with desk jobs in the article a home movement plan for people who sit a lot, and about taking care of the lower back in the text the lumbar spine - how to take care of it every day.
Frequently asked questions
How can I strengthen my knee joints at home?
Most often through regular moderate-intensity activity (walking, cycling, an elliptical) and exercises that strengthen the thigh and hip muscles, e.g. sit-to-stands, bridges or straight leg raises. Exercise without pain, and if you have any complaints, consult a doctor or physical therapist first.
What is the best sport for your knees?
There is no single best one. People often choose smooth, low-impact activities: walking, cycling, swimming, the elliptical. The most important thing is that the activity is regular and matched to your fitness level.
Is an elliptical hard on the knees?
On an elliptical your feet stay in contact with the pedals the whole time, so there is no landing phase like in running. Good technique, proper setup and gradually increasing resistance are important. If you have knee problems, ask a doctor or physical therapist whether this kind of training is right for you.
Can you exercise with knee pain?
It depends on the cause of the pain, so consult a doctor or physical therapist first. Exercise should not cause or worsen joint pain.
How often should you do knee exercises?
Many people do strengthening exercises 2-3 times a week, with a rest day in between. Activities like walking or cycling can be done more often, even daily.
Are stairs bad for your knees?
Climbing stairs is an ordinary everyday activity. However, if going down or up the stairs causes pain, use the railing, place your whole foot on the step and discuss your symptoms with a doctor.
Do supplements strengthen knee joints?
We do not give recommendations on supplements. Talk to a doctor or pharmacist about whether to use them, especially if you take medications.
Is the FreeStep trainer rehabilitation equipment?
No. FreeStep is a trainer for home workouts, not a medical device. You exercise on it seated, moving your arms and legs smoothly, without your feet striking the ground. If you have any complaints, discuss training with a doctor or physical therapist.
Teeter equipment for home workouts
- Teeter FreeStep LT1 - a recumbent cross trainer (seated stepper) with 13 levels of quiet magnetic resistance and an adjustable seat.
- Teeter FreeStep LT3 - the same motion as the LT1, with UltraGlide bearings, a ComfortSelect seat and SoftStep pedals.
- Teeter Core Restore - a PVC rubber wedge cushion that can serve as an unstable pad for balance exercises.
