If you have knee osteoarthritis (OA), you have probably heard the advice to “keep moving”. What you may not have received is any specific guidance on what todo, how often to do it, or how to avoid making things worse.
Osteoarthritis knee exercises are effective when applied correctly, and the evidence supporting them is robust. This article explains what the research shows, why exercise helps in ways that go well beyond muscle strength, and gives you a structured programme you can start today.
What the Research Says About Osteoarthritis Knee Exercises
The evidence is clear and consistent: exercise is a core treatment for knee osteoarthritis.
A Cochrane Review on exercise for osteoarthritis of the knee found that land-based exercise reduces pain and improves physical function and quality of life in people with knee OA. The Australian Osteoarthritis of the Knee Clinical Care Standard lists exercise as a first-line recommendation, alongside education and weight management, ahead of surgical interventions and many medications.
This matters because many people with knee OA arrive at physiotherapy having been told to rest or to avoid activities that cause discomfort. The evidence points in the opposite direction. Appropriate, graduated exercise is not only safe for most people with knee OA; it is one of the most reliably effective things you can do to manage your condition.
Recent evidence suggests that aerobic exercise may produce the greatest overall improvements in pain, walking ability, physical function, and quality of life. Strength training is also strongly supported, particularly for building the muscle support around the knee joint. The best outcomes tend to come from combining both.
Why Exercise Helps Beyond Muscle Strengthening
People who stick with an exercise programme for six to eight weeks often notice that stair climbing becomes noticeably easier and their walking distance increases. Here is why that happens.
Exercise does far more than build muscle. Four key mechanisms explain why it works so well for knee OA:
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- Pain processing. Regular exercise can alter how your nervous system processes pain signals, reducing sensitivity over time. This means the same activity gradually becomes less uncomfortable, not because your joint has changed structurally, but because your body’s response to that pain shifts.
- Joint nourishment. Cartilage has no direct blood supply. It relies on movement and loading to absorb nutrients from the surrounding joint fluid. Think of cartilage like a sponge: it needs to be compressed and released regularly to stay nourished. Without movement, that exchange slows down.
- Functional improvement. As strength and confidence build, everyday tasks become easier. This includes walking longer distances, climbing stairs with less effort, and improving balance and stability, which also reduces fall risks.
- Weight management. Even modest reductions in body weight reduce the load going through the knee joint during walking. Exercise supports weight management and, in doing so, reduces the mechanical stress on an already sensitive joint.
What to Expect When You Start
Before you look at the programme below, it is worth understanding what normal and abnormal responses to exercise look like. This is one of the most common reasons people stop exercising before the benefits begin.
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- Mild discomfort during exercise (3 out of 10 or below on a pain scale) is generally acceptable. Some muscle ache and slight joint awareness during and after activity is a normal response, particularly when you are getting started.
- Pain above 5 out of 10 during exercise is a signal to modify. Reduce the intensity, range of motion, or number of repetitions rather than stopping completely.
- Swelling or pain that persists beyond 24 to 48 hours after exercise is a signal to reassess. This suggests the activity or volume was too much for your joint at this stage. Reduce the load, allow full recovery, and return at a lower starting point.
The Types of Exercise Most Supported by Evidence
Three categories of exercise have the strongest evidence base for knee osteoarthritis.
Aerobic exercise includes walking, stationary cycling, swimming, and hydrotherapy. These activities improve cardiovascular fitness, support weight management, and have a direct positive effect on pain and function. Water-based options are particularly valuable when weight-bearing activities are too uncomfortable to start with. The health benefits of hydrotherapy make it an especially well-suited option for people with knee OA who find land-based activity difficult early on.
Strength training targets the muscle groups that support the knee: the quadriceps at the front of the thigh, the hamstrings at the back, the gluteal muscles of the hip, and the calf muscles. Weakness in these areas increases stress on the joint and reduces stability. Exercises such as sit-to-stands, mini squats, step-ups, straight-leg raises, and calf raises all address this.
Flexibility and range-of-motion work focuses on maintaining and gradually improving how far the knee bends and straightens. Gentle stretching and knee mobility exercises help reduce stiffness, particularly the morning stiffness that many people with OA describe as one of their most limiting symptoms.
Your Starting Programme: A Safe, Structured Beginning
The following programme is appropriate for most adults starting out with knee osteoarthritis exercises; however, an individualised program will always be the safest way to begin.
Additionally, a physio or exercise physiologist-led class, such as our Senior Strength Classes, is a great place to start.
Aerobic Activity
Frequency: 3 to 5 days per week
Duration: 10 to 15 minutes to begin with
Choose one or a combination of:
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- Walking on flat ground
- Stationary cycling
- Pool walking
The goal at this stage is consistency, not intensity. A pace at which you can hold a conversation is appropriate.
Strength Exercises
Frequency: 2 to 3 times per week
Volume: 1 to 2 sets of 8 to 12 repetitions per exercise
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- Sit-to-stand
Begin seated in a firm chair at a comfortable height, with your feet flat on the floor. Lean forward slightly at the hips and use the strength of your legs to stand. Use your arms for support if needed. As strength improves, aim to complete the movement without using your hands. This exercise builds quadriceps, hamstrings, and glute strength for the most fundamental daily movement patterns.
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- Mini squat
Stand with feet shoulder-width apart, holding a bench or chair for support. Bend your knees to around 30 to 45 degrees, keeping your knees tracking over your toes, then return to standing. This builds quadriceps strength through a controlled, limited range that minimises joint load.
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- Step-up
Stand in front of a low step (a single stair works well). Step up with one foot, bring the other foot to meet it, then step back down with control. This develops single-leg strength and hip stability, both of which reduce how much the knee has to compensate during walking.
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- Straight-leg raise
Lie on your back with one knee bent and one leg straight. Tighten the thigh of the straight leg and raise it to about 45 degrees, then slowly lower. This builds quadriceps strength without bending the knee under load, making it particularly useful when full knee flexion is uncomfortable.
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- Calf raise
Stand behind a chair, holding the back for support. Rise slowly onto your toes, then lower back down with control. This strengthens the calf muscles, which play an important role in supporting the knee during walking and absorbing load during movement.
Mobility Work
Frequency: Daily
Volume: 2 to 3 sets of 10 repetitions for movement exercises; hold each stretch for 20 to 30 seconds
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- Knee bends and straightening (seated or lying)
- Gentle quadriceps stretch
- Gentle calf stretch
Mobility work is brief but valuable. Doing it daily, even on days when you are not doing strength training, helps manage stiffness and keeps the joint moving through its available range.
Taking the Next Step with GLAD
If you have started the programme above and found it helpful but want a more structured approach, or if you would prefer to work through it alongside others in a similar situation, the GLAD programme (Good Life with Arthritis from Denmark)may be worth considering.
GLAD is a standardised, evidence-based programme developed specifically for people with hip and knee osteoarthritis. It combines neuromuscular exercise sessions designed to improve joint control and loading patterns with group education sessions covering joint health, self-management strategies, and how to stay active long term. Outcomes are tracked throughout, which gives you a clear picture of how you are progressing.
The key difference between GLAD and a self-directed programme is the neuromuscular component. Where general strengthening builds muscle around the joint, neuromuscular training improves how the brain and muscles coordinate movement, which reduces abnormal loading patterns that contribute to pain over time. The group education sessions also address the self-management knowledge that helps people maintain progress well beyond the programme itself.
The team at North West Physio delivers GLAD for people in the local area. You can read more about the benefits of the GLAD program on the North West Physio website. If you are ready to take a more structured approach to managing your knee osteoarthritis, get in touch to find out whether GLAD is the right fit for you.
What to Avoid or Modify
No exercise category needs to be permanently avoided if it is well tolerated. However, certain activities are more likely to provoke symptoms, particularly when starting out, and may need modification.
Deep squats performed with poor control place high load through the knee at end range. Begin with mini squats at 30 to 45 degrees and increase depth only as strength and control improve.
High-volume jumping and plyometrics generate significant impact forces and are not appropriate as a starting point for knee OA. They may have a place in a more advanced programme, but only once a solid foundation of strength and tolerance has been established.
Sudden increases in activity volume are one of the most common causes of flare-ups. The rule of thumb is to increase only one variable at a time, and by no more than 10 per cent per week. Slowly increase volume before intensity, and always allow adequate recovery between sessions. If you have been relatively inactive, even moderate walking may need to be introduced gradually. Starting at 10 minutes and building from there is entirely appropriate and far more sustainable than beginning with a 45-minute walk and spending the next three days recovering.
How to Progress: Moving from Beginner to Intermediate
Progression should be gradual and informed by how your body is responding. Signs that you are ready to progress include:
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- Exercises feel relatively easy at your current load
- Pain during and after exercise remains at 3 out of 10 or below
- No prolonged flare occurs in the 24 to 48 hours after training
- Function in daily activities is noticeably improving
When these criteria are met, progress by changing one variable at a time.
Volume: Increase from 1 set to 2 to 3 sets per exercise before adding any other challenge.
Resistance: Once volume feels manageable, add ankle weights, introduce resistance bands, or increase load on gym machines. Even 0.5 to 1 kilogram of added resistance represents meaningful progression.
Complexity: Progress from double-leg to single-leg variations of exercises. Move from flat walking to gentle inclines. Transition from supported to unsupported balance work, such as standing on one leg without holding a chair.
Aerobic duration: Build gradually from 10 minutes toward 20 minutes, then 30 to 45 minutes over several weeks. Duration before intensity is the safer progression path for most people with knee OA.
When to See a Physiotherapist Rather Than Starting Alone
This programme is designed to give you a safe starting point for self-directed exercise. However, there are situations where working with a physiotherapist from the beginning makes more sense.
Consider seeing a physiotherapist if:
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- Pain is severe or makes walking difficult
- There is significant loss of knee movement
- Exercise consistently triggers large flares that do not settle within 48 hours
- You are unsure whether your diagnosis is confirmed
- Multiple health conditions complicate your exercise choices
- You simply lack confidence about where to start
A physiotherapist can assess your specific movement patterns, identify limitations that are not obvious from symptom description alone, and build a programme around your individual presentation rather than a general template. For people in north Brisbane, the team at North West Physio brings together physiotherapy, exercise physiology, and allied health services to support exactly this kind of individualised care.
For further guidance on physio exercises for the knee and how a structured programme can be tailored to your needs, the team at North West Physio can help you build on what you have started here.
When to Seek Medical Assessment First
Exercise is appropriate for most people with knee OA, but there are situations that warrant medical review before beginning.
See a doctor before starting exercise if you have:
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- Significant unexplained swelling in the knee
- Redness and warmth that may suggest infection or inflammatory arthritis
- A recent knee injury or suspected fracture
- Sudden inability to bear weight
- Locking of the knee joint
- Rapid worsening of symptoms
Medical clearance may also be advisable if you have:
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- Unstable or uncontrolled cardiovascular disease
- Uncontrolled high blood pressure
- Severe respiratory disease
- Uncontrolled diabetes
- Recent surgery
- Serious neurological conditions
For most adults with typical knee OA and no significant comorbidities, beginning a graduated, low-impact programme is both safe and strongly recommended by current clinical guidelines. When in doubt, a brief conversation with your GP can provide reassurance before you start. You may also find it helpful to read more about physiotherapy for arthritis to understand how a broader treatment approach can complement what you are doing on your own.
Frequently Asked Questions
Is it safe to exercise with knee osteoarthritis?
Yes, for most people it is. Exercise is recommended as a core treatment by Australian and international clinical guidelines. The key is starting at an appropriate level and progressing gradually. If you have significant comorbidities or red flag symptoms, seek medical advice before starting.
How long before I notice improvements?
Most people begin to notice meaningful improvements in pain and function within six to eight weeks of regular exercise. Some people notice earlier gains in stiffness management, particularly with daily mobility work.
What if my knee swells after exercise?
Some mild puffiness after exercise can occur when you are first starting out. If swelling is significant or persists beyond 24 to 48 hours, reduce the volume or intensity of your next session and allow full recovery. If swelling is severe, sudden, or accompanied by warmth and redness, seek medical assessment.
Should I exercise on bad pain days?
It depends on the severity. On days when pain is higher than usual, gentle mobility work and a shorter, lower-intensity aerobic session are usually better than full rest. Complete rest is rarely the optimal response to an OA flare; maintaining gentle movement helps manage stiffness without aggravating the joint further.
