Quick answer: walking, cycling, swimming, water-based classes, and twice-weekly strength training all reduce joint pain and improve function — this is one of the best-supported findings in arthritis research. Land-based exercise produces slightly better strength gains; water-based exercise causes fewer flare-ups. The best programme is the one you’ll actually keep doing, because adherence, not exercise type, is where most people fall short.
What this guide covers
- Why exercise beats rest for painful joints
- How much you actually need
- The six best low-impact options
- Why strength training matters most
- Water vs. land: what the research says
- A realistic first four weeks
- How much pain is too much
- What to be cautious with
- Common questions
- The takeaway
Why exercise beats rest for painful joints (Evidence: Strong)
The instinct to rest a sore joint is understandable and, beyond the first day or two of a flare, usually counterproductive. Inactivity weakens the muscles that stabilise the joint, stiffens surrounding tissue, and reduces the joint’s tolerance for everyday load — so ordinary activities start to hurt more, which encourages more rest.
The CDC’s arthritis guidance is direct on this point: physical activity such as walking, biking, and swimming decreases arthritis pain and improves function, mood, and quality of life. Reviews of the trial evidence consistently find that both strength training and aerobic exercise significantly improve pain, physical function, and general health in people with knee osteoarthritis.
The same reviews flag the real obstacle: long-term adherence is poor. Which is why the practical goal is a routine you can sustain for years, not an optimal one you abandon in three weeks.
How much you actually need
The standard target is 150 minutes of moderate-intensity activity per week plus strength training on two days. That sounds like a lot when your knees hurt, so two clarifications matter.
First, it can be broken into small pieces — five 10-minute walks across a day count the same as one 50-minute walk. Second, and more importantly, the CDC notes that any physical activity is better than none. The benefit curve is steepest at the beginning: going from nothing to a little produces the largest relative gain. Starting at 10 minutes a day is not a failed version of the guideline; it’s the correct starting point for most people in pain.
The six best low-impact options
1. Walking
The most accessible option and better tolerated than most people expect. Supportive footwear and flat terrain to start; add distance before adding pace. If 10 minutes is uncomfortable, walk 5 minutes twice.
2. Stationary or outdoor cycling
Excellent for knees, because the pedal stroke moves the joint through a smooth range without impact while building the quadriceps that protect it. Set the saddle high enough that your knee stays slightly bent at the bottom of the stroke; a saddle that’s too low is a common source of knee pain.
3. Swimming
Near-zero joint loading with full-body conditioning. Useful when weight-bearing exercise is currently too painful.
4. Water aerobics or aquatic classes
Water supports body weight while providing gentle resistance in every direction. If sleep is also suffering because of joint discomfort, better rest lowers next-day pain sensitivity — see how to fall asleep faster. Research specifically notes fewer adverse effects than land-based programmes — a meaningful advantage if you flare easily.
5. Strength training
Two sessions per week, covering the major muscle groups — particularly those around the affected joints. Bodyweight, resistance bands, or machines all work. See the section below on why this deserves priority.
6. Tai chi and gentle yoga
Slow, controlled movement that trains balance and range of motion. For a short daily version, see our simple mobility routine for stiff joints. Tai chi in particular is frequently recommended in arthritis management for its combination of mobility work and fall-risk reduction. Tell the instructor about your joints so poses can be modified.
Why strength training matters most (Evidence: Strong)
If you only have capacity for one addition, make it strength work. Muscle acts as a shock absorber: stronger quadriceps, glutes, and hamstrings absorb force that would otherwise pass through the knee joint itself. In the comparison research between water and land programmes, land-based exercise — which typically involves more loaded strength work — was the one that showed measurable improvements in muscle strength alongside pain.
Start light and prioritise controlled form over load. Sit-to-stands from a chair, wall sits, step-ups on a low step, and resistance-band leg presses are all reasonable entry points for knee-related pain.
Water vs. land: what the research says (Evidence: Moderate)
A meta-analysis comparing aquatic and land-based exercise in knee osteoarthritis found no significant difference between them for pain relief, physical function, or quality of life, over both short and long term. The differences were at the margins: land-based programmes showed improvements in pain and muscle strength versus control, while aquatic programmes produced significantly fewer adverse effects.
The practical reading: if you tolerate land exercise, it offers slightly more strength benefit. If land exercise flares your joints or you’re returning after a long gap, water is the gentler on-ramp — and you can transition later.
A realistic first four weeks
- Week 1: 10 minutes of walking or cycling, 5 days. One short strength session of 2 exercises.
- Week 2: 15 minutes, 5 days. Two strength sessions.
- Week 3: 20 minutes, 5 days. Two strength sessions, add one exercise.
- Week 4: 25–30 minutes, 5 days. Two strength sessions. You are now at or near the 150-minute target.
If a week feels too hard, repeat it rather than pushing forward. Progress that holds beats progress that breaks.
How much pain is too much
A widely used rule in arthritis rehabilitation: mild discomfort during and shortly after exercise is acceptable. If soreness is still elevated more than two hours after you finish, or you wake the next morning noticeably worse, the session was too much — reduce duration or intensity by about a third next time rather than stopping altogether.
Sharp, sudden pain, new swelling, or a joint that locks or gives way are different signals — stop and get those assessed. See early signs of arthritis for what warrants an appointment.
What to be cautious with
High-impact activities — running on hard surfaces, jumping, contact sports — aren’t universally forbidden, but they’re a poor starting point during active joint pain. Deep squatting and kneeling often aggravate knee osteoarthritis. Rapid twisting movements can provoke symptoms. None of this is permanent: as strength improves, tolerance usually improves with it.
Exercise works best alongside the other evidence-backed basics — see our guide on how to reduce joint pain naturally for weight management, heat and cold, diet, and supplement evidence.
Common questions
Will exercise wear my joints out faster?
Moderate low-impact exercise has not been shown to accelerate cartilage loss in osteoarthritis, and the functional benefits are well established. Inactivity carries clearer risks.
Should I exercise during a flare-up?
Scale down rather than stop. Gentle range-of-motion movement often helps; heavy loading usually doesn’t. Return to your normal programme as symptoms settle.
How quickly will I notice a difference?
Most exercise trials measure outcomes at 8–12 weeks. Some people notice reduced stiffness within 2–3 weeks, but judge the programme at the two-to-three month mark.
Do I need a physiotherapist?
Not necessarily, but it helps — particularly if you have significant pain, a previous injury, or aren’t sure which exercises suit your joint. One or two sessions to set up a programme is often enough.
The takeaway
Exercise is the closest thing to a proven treatment for joint pain that doesn’t come from a pharmacy. Aim for 150 minutes of low-impact activity per week plus two strength sessions, but start far smaller than that and build. Choose land-based work for strength, water-based work for gentleness, and whichever you’ll repeat for the tolerance that matters most. Use the two-hour soreness rule to calibrate, and give it two to three months. More in our Joint Health hub and across all our guides.
This article is for educational and informational purposes only and is not medical advice. Consult a qualified healthcare professional before starting a new exercise programme, particularly if you have significant joint damage, a recent injury, heart or lung conditions, or are recovering from surgery. Read about how we review content.
References
- CDC — Self-Care for Arthritis: Five Ways to Manage Your Symptoms. cdc.gov/arthritis/caring
- Is aquatic exercise more effective than land-based exercise for knee osteoarthritis? A meta-analysis. Medicine (Baltimore). 2018. PubMed 30593178
- Systematic review and meta-analysis comparing land and aquatic exercise for people with hip or knee arthritis. BMC Musculoskelet Disord. PMC3141607
- The Critical Role of Physical Activity and Weight Management in Knee and Hip Osteoarthritis. J Rheumatol. 2024. jrheum.org