You can often exercise with knee pain by choosing low-impact activities, starting with short sessions, and increasing effort slowly. Walking on level ground, stationary cycling, water exercise, and gentle strengthening may be easier on the knees than running or jumping. Warm up first, use comfortable supportive shoes, and stop if pain becomes sharp or increases. Get medical advice before exercising after a significant injury or with concerning symptoms.
Knee pain can make exercise feel difficult, but avoiding all movement is not always necessary. The right activity can help maintain mobility, strengthen the muscles that support the knee, and improve everyday function. The safest approach depends on what is causing the pain, how it affects movement, and whether the knee has recently been injured.
Can you exercise when your knee hurts?
In many cases, yes. People with ongoing knee discomfort may be able to remain active by changing the type, duration, or intensity of their workouts. For example, replacing a run with a short walk or stationary cycling session may reduce the impact on the knee while allowing you to stay active.
According to Mayo Clinic's guidance on knee pain, swimming, water aerobics, and other low-impact activities may be useful alternatives for people with chronic knee pain, osteoarthritis, or recurring injuries. However, an exercise that feels comfortable for one person may aggravate another person's symptoms.
If your pain began after a fall, a sudden twist, or a sports injury, do not assume that an ordinary workout is safe. A new injury may require assessment before you return to exercise, especially if swelling, instability, or difficulty bearing weight is present.
Which exercises are easier on painful knees?
Start with activities that allow controlled movement without repeated jumping, hard landings, or sudden changes in direction. You can then adjust the activity according to how your knee responds.
Walking on a level surface
Walking may be a suitable starting point when you can put weight on your leg comfortably and walk without a significant limp. Choose a flat, even route and begin with a distance you can manage without increasing your discomfort. Walk at a comfortable pace rather than trying to maintain your usual speed or distance.
If a longer walk brings on pain, try shorter sessions with breaks between them. A flat indoor walking route may be easier to manage than uneven ground, steep hills, or repeated stair climbing.
Stationary cycling
A stationary bicycle provides a way to move the knee repeatedly without the impact of running. Begin with low resistance and a comfortable pace. Adjust the seat so your leg remains slightly bent when the pedal reaches its lowest position, rather than forcing your knee into a deep bend.
If pedaling causes sharp pain or makes your symptoms worse, stop and reconsider the seat position, resistance, or activity. A physiotherapist can help you adjust your technique if cycling remains uncomfortable.
Swimming and water exercise
Swimming and suitable exercises in a pool can offer ways to stay active while reducing the amount of body weight supported by the legs. Water walking and gentle leg movements may be easier than similar activities on land. Choose movements that feel controlled, and use a pool with safe access and appropriate support.
Not every water activity is automatically knee-friendly. Forceful kicking, jumping into water, and movements that require deep knee bending may still cause discomfort. Select strokes and movements that fit your current abilities.
Gentle flexibility and range-of-motion exercises
Slow, controlled knee movements may help maintain flexibility when stiffness makes it difficult to move comfortably. For example, while sitting on a stable chair, you can slowly straighten one leg within a comfortable range and then lower it again. Avoid forcing the knee to straighten completely or bending it farther than feels comfortable.
Stretching the muscles around the thigh and calf may also be useful, particularly when tightness limits comfortable movement. Stretches should be gentle rather than forceful. If the knee is very swollen, acutely injured, or difficult to move, obtain professional guidance before trying new exercises.
How can you strengthen the muscles around the knee?
The muscles in the thighs, hips, and lower legs help support movement at the knee. Gradual strengthening can improve muscle function and help with activities such as standing up from a chair, walking, and climbing stairs. Choose exercises that suit your current mobility and avoid movements that produce sharp or increasing pain.
The American Academy of Orthopaedic Surgeons (AAOS) knee conditioning program includes exercises for the quadriceps, hamstrings, calves, and hip muscles. Its guidance also emphasizes using appropriate technique and checking with a doctor or physical therapist when an exercise causes pain.
Examples of exercises to discuss with a healthcare professional
- Seated leg extensions: Sit upright on a sturdy chair and slowly straighten one leg within a comfortable range. Pause briefly, then lower it with control.
- Straight-leg raises: Lie on your back with one knee bent and the other leg straight. Tighten the thigh of the straight leg, lift it a short distance, and lower it slowly. Avoid this exercise if getting into or out of the position is unsafe or uncomfortable.
- Supported heel raises: Stand behind a sturdy chair or hold a stable countertop. Slowly lift your heels, then lower them while keeping your balance.
- Gentle sit-to-stand practice: From a firm, relatively high chair, lean forward slightly and stand up using controlled movement. Use your hands for support if needed, and do not continue if the movement increases knee pain.
These are examples, not a complete rehabilitation program for every knee problem. You do not need to perform all of them. Start with movements appropriate for your abilities, and ask a physiotherapist to demonstrate correct technique or suggest alternatives if you have difficulty with a particular exercise.
How should you start and increase exercise?
Starting with less activity than you think you can manage may help you find a comfortable level without aggravating symptoms. The Arthritis UK guide to getting started with exercise recommends beginning slowly and building up gradually by changing how often you exercise, how long you exercise, or how hard you work.
Warm up before each session
Begin with several minutes of gentle movement, such as easy walking or very light stationary cycling, if you can do so comfortably. A gradual warm-up helps prepare your body for activity. Avoid sudden sprints, forceful stretches, or jumping straight into demanding exercises.
Keep the first sessions short
Choose a manageable amount of activity rather than trying to complete your usual workout immediately. You could divide exercise into shorter sessions throughout the day if one longer session is uncomfortable. Focus first on being able to move comfortably and consistently, rather than reaching a particular speed, distance, or number of repetitions.
Increase one part of your routine at a time
When an activity becomes comfortable, increase its duration, frequency, or effort gradually rather than raising all three at once. For example, extend a comfortable walk before adding hills or increasing your pace. If symptoms become worse during or after a change, return to the previous level or reduce the activity further.
Finish with a gradual cool-down
End with a few minutes of slower movement instead of stopping suddenly after a demanding session. Gentle movements and comfortable stretches may help limit stiffness. Drink water as needed, and make time to rest between more demanding strengthening sessions.
How can you tell when to modify or stop an exercise?
Pay attention to how your knee feels during exercise and afterward. You should not push through sharp, increasing, or movement-altering pain to complete a workout. If an exercise causes discomfort, stop that movement and try an easier version only if it is comfortable to do so.
The AAOS guidance advises people not to ignore pain during knee conditioning exercises and to consult a doctor or physical therapist if pain occurs. If discomfort continues after you stop, swelling increases, or your usual walking becomes more difficult, pause the activity and seek guidance rather than repeatedly testing the knee.
It can be useful to notice how your knee responds later in the day and the following morning. If it repeatedly feels worse after a particular workout, the session may be too demanding or the activity may not be appropriate at that time. Reduce the duration or effort, change activities, or ask a physiotherapist to review your exercise plan.
Which exercises should you avoid or change temporarily?
You do not necessarily need to give up an activity permanently because your knee hurts. However, certain movements may need to be reduced, modified, or temporarily avoided if they aggravate your symptoms.
- Running and jumping: Replace these with a lower-impact activity if repeated impact increases pain.
- Deep squats and lunges: Reduce the depth or choose another strengthening exercise if deep bending is uncomfortable.
- Rapid twisting and sudden direction changes: Avoid movements that provoke pain or make the knee feel unstable, especially during recovery from an injury.
- Heavy resistance exercises: Use lighter resistance and controlled movements rather than forcing a painful repetition.
- Repeated stair climbing or steep hills: Reduce these activities if they repeatedly aggravate your knee, and choose a flatter route where possible.
The aim is not to avoid every movement that bends the knee. Instead, find a comfortable range and level of effort, then increase your activity as tolerated. If even gentle movement is painful or your knee repeatedly gives way, obtain medical advice before trying more challenging exercises.
When should you seek medical advice before exercising?
Some knee symptoms need prompt assessment rather than a change in workout intensity. The NHS guidance on knee pain recommends urgent medical advice when the knee is very painful, cannot be moved or bear weight, becomes badly swollen or changes shape, or locks or gives way painfully. A hot or red knee accompanied by fever or feeling very unwell also needs urgent attention.
- You cannot put weight on the affected leg or cannot move the knee normally.
- Your knee becomes markedly swollen, changes shape, or repeatedly locks or gives way.
- The knee is red or hot and you have a fever, chills, or feel unwell.
- You have significant pain following an injury, particularly after a fall or sudden twisting movement.
Seek a medical assessment if knee pain persists for several weeks, is getting worse, disturbs sleep, or interferes with ordinary activities. A healthcare professional can review your history and symptoms, examine the knee, and recommend an appropriate activity plan. A physiotherapist may then help you choose exercises, adjust technique, and progress safely.
How can you make exercise a regular habit with knee pain?
Choose activities that fit your current abilities and that you enjoy enough to repeat. Depending on your needs, you might alternate comfortable walking with stationary cycling, water exercise, or suitable strengthening movements. Having a few alternatives means you can change your routine when one activity becomes uncomfortable without giving up exercise altogether.
Plan rest breaks before you become exhausted, use supportive footwear for weight-bearing exercise, and choose a stable surface with enough room to move safely. If balance is a concern, exercise near a sturdy support or with someone available to help. Consistency matters more than intensity: a manageable routine that you can maintain is usually more practical than occasional sessions that leave your knee feeling worse.
Above all, let your symptoms and recovery guide your progress. Safe exercise is not about ignoring pain or pushing through every workout. It is about choosing suitable movement, increasing activity gradually, and getting professional help when the knee is not responding as expected.