Water Exercise vs Walking for Joint Pain

Why people type this exact phrase into a search bar

'My knee makes a grinding sound,' or 'It only hurts going down the stairs.' Those are the phrases showing up in search bars more often lately, and they are almost word for word what patients say when they first sit down in a physical therapy clinic. Stiffness on the first step out of bed. A hand instinctively pressing on the knee to stand up from a chair. On a bad day, not being able to bend down far enough to trim a toenail, because the hip or knee has gotten too stiff to reach the foot.

At this point the advice usually splits two ways. One camp says walk more, plain and simple. The other says stop walking and get in a pool instead. Neither answer is wrong on its own, but which one fits better depends on how much pain is present right now, how much weight the joint is carrying, and whether this is a flare-up or a quiet stretch. This guide walks through how the two forms of exercise actually load the joint differently, and which one to reach for first depending on where things stand.

One thing worth saying up front: this is not an either-or choice. In real rehab settings, water-based exercise is usually used to protect the joint and hold onto strength during a flare, then walking is layered back in as pain settles. If reduced hip range of motion is making it hard to trim toenails, the guide on hip range-of-motion loss is worth reading alongside this one.

How joint loading actually differs between water exercise and walking

The decisive difference between the two is buoyancy. Once the body is submerged, buoyancy takes over a large share of body weight, so what looks like the same walking motion places far less compressive force on the knee cartilage. Harrison and colleagues (1992) measured weight-bearing load at different immersion depths and found that at chest-to-xiphoid depth, joint loading drops to roughly 25 to 28 percent of body weight; at waist depth it is closer to 50 percent, and at neck depth it can fall to around 10 percent.

Running the numbers for a 60kg body

For someone weighing 60kg walking in chest-deep water, the actual load reaching the knee works out to roughly 15 to 17kg. Compare that to walking down a flight of stairs on dry land, where a classic biomechanics study (Reilly & Martens, 1972) put the peak compressive force on the patellofemoral joint at 3.3 to 3.5 times body weight — close to 200kg of momentary load for that same person. Even level-ground walking on land loads the joint at close to body weight or more, so the gap between water walking and land walking is bigger than it feels in the moment.

That does not make walking a bad exercise

Less load is not automatically better, though. Bone needs a certain amount of weight-bearing stress to maintain density, and buoyancy removes most of that stimulus — which is why relying on water exercise alone leaves something to be desired for bone health. On the cartilage side, some clinicians argue the opposite: repeated compression and release with each step on land helps circulate nutrients through the cartilage. In practice, the sensible approach is to lean on the lower-load option during a flare and bring in the higher-load option — walking — once pain is under control.

When water exercise is the better starting point

In clinical practice, patients carrying more than 70kg, or those with advanced knee osteoarthritis, frequently give up on exercise altogether after their first attempt at land walking leaves them in worse pain the next morning. For this group, water exercise is usually the better place to start.

Situations where water exercise should come first

• Higher body weight: the more weight involved, the greater the absolute load reaching the knee during land walking. The low-impact exercise guide covers this in more depth.
• Advanced knee osteoarthritis: once cartilage has already worn down, walking itself can be a burden, and a staged approach matters. See the stage-by-stage guide for how that staging works.
• Balance concerns or fall risk: a fall in water rarely causes real impact, which also makes it psychologically easier to keep showing up.
• Early recovery after knee or hip surgery: useful during the window when the repaired tissue or implant should not be carrying full load yet.

Lim and colleagues (2010) ran an 8-week randomized controlled trial with 64 Korean adults with obesity and knee osteoarthritis, comparing aquatic exercise to land-based exercise. Both groups improved in pain and function, but participants with a higher BMI showed larger pain reductions in the aquatic group. The sample was modest and the follow-up window short, so it is worth being cautious about extrapolating these findings to long-term outcomes.

When walking is the better starting point

On the other hand, plenty of people do not have easy access to a pool, are uneasy in water, or have a skin or bladder condition that makes pool exercise impractical. For this group, walking alone can manage joint health perfectly well.

Situations where walking should come first

• Mild or early-stage pain: if stiffness is limited to a few minutes in the morning and loosens up with movement, starting with walking is reasonable.
• Bone density is a concern: for postmenopausal women in particular, a weight-bearing exercise like walking works more directly on osteoporosis prevention.
• Pool access is limited: distance, cost, or scheduling constraints make daily walking a more realistic habit to keep.
• Cardiovascular fitness is also a priority: outdoor walking adds sunlight exposure and cardiovascular benefit that pool sessions do not replicate.

A Cochrane systematic review by Bartels and colleagues (2016), pooling trials in knee and hip osteoarthritis with roughly 1,190 participants combined, concluded that aquatic exercise is not clearly superior to land-based exercise. There was a modest short-term edge in pain reduction for the aquatic groups (a standardized mean difference around -0.31), but the certainty of evidence was rated low to moderate, and the benefit tended to fade quickly once the program ended. The takeaway is less about which modality wins and more about which one a person can actually stick with.

See a doctor right away if any of this applies — before starting either exercise

Whether the plan is water exercise or walking, the following situations call for an orthopedic or neurology evaluation before starting anything. Self-diagnosing and delaying that visit is not a safe substitute.

• Pain that wakes you up at night: this pattern can point beyond ordinary musculoskeletal pain and needs to be ruled out.
• Unexplained weight loss: alongside joint pain, this combination always warrants a medical visit.
• Fever with a hot, swollen knee or hip: this can signal a joint infection that needs urgent care.
• Loss of bladder or bowel control, or weakness spreading through both legs: this may point to a spinal or nerve issue and needs immediate evaluation.
• Severe pain after a fall or injury that prevents bearing weight: a fracture or ligament tear needs to be ruled out first.
• The leg suddenly giving way while walking: this can reflect knee instability or nerve compression.

If any of these apply, do not attempt either water exercise or walking on your own judgment. Get evaluated first, then discuss with your clinician what intensity of exercise, if any, is appropriate right now.

Water walking and water squats, step by step

The instructions below assume a pool depth somewhere between the chest and the bottom of the sternum. If dizziness has been an issue, stay within reach of a wall rail or handhold the entire time.

Stationary water walking

1. Starting position: stand in the water with the back straight, feet hip-width apart, eyes forward.
2. Movement: march in place slightly slower than a normal walking pace, lifting each knee to roughly hip height, swinging the arms naturally opposite to the legs.
3. Breathing: inhale through the nose as the knee lifts, exhale slowly through the mouth as the foot lowers. Never hold the breath.
4. Reps and sets: start with five rounds of one minute marching followed by 30 seconds of rest, for about seven to eight minutes total.
5. Frequency: three times a week; after two weeks of comfortable adaptation, extend each round to one minute thirty seconds.
6. Common mistake: leaning the torso forward to fight the water's resistance. Keeping the trunk upright with a light brace through the abdomen protects both the knees and the lower back.

Rail-supported water squats

1. Starting position: hold a wall rail or handhold lightly with both hands, feet shoulder-width apart.
2. Movement: sit the hips back and lower slowly, keeping the knees tracking over the toes, without bending past roughly 90 degrees, then rise back up.
3. Breathing: inhale on the way down, exhale on the way up.
4. Reps and sets: begin with 8 reps for 2 sets, progressing to 12 reps for 3 sets once it feels pain-free.
5. Frequency: pair it with a walking session or do it separately two to three times a week.
6. Common mistake: hanging so much weight on the handhold that the legs barely work. The handhold is for balance only — the effort should come from the legs.

Knee-friendly walking, step by step

1. Starting position: wear cushioned shoes, keep the back and hips upright, and look 10 to 15 meters ahead. Rather than standing up from a chair and walking straight off, warm up the ankles and knees first with ten easy bends.
2. Movement: shorten the stride slightly, land heel-first, and roll weight forward across the full foot. Skip stairs taken two at a time and avoid sudden changes of direction.
3. Breathing: aim for a rhythm of one inhale every three steps and one exhale every three steps. If breathing gets too hard to hold a conversation, slow down.
4. Duration and distance: begin with ten-minute sessions and add five minutes every one to two weeks, working up to 20 to 30 minutes.
5. Frequency: aim for four to five sessions a week, cutting the time in half or resting entirely on days when pain flares.
6. Common mistake: doubling the distance the moment pain disappears. Joint tissue needs time to adapt, so keeping weekly increases under 10 percent is the safer bar.

On days with a lot of squatting or kneeling — gardening, weeding, tending a yard — plan for a shorter walk than usual. The joint is already carrying elevated internal pressure after extended time in a deep bend.

A four-week plan for combining water exercise and walking

For a flare that is moderate — roughly 4 to 5 out of 10 on a pain scale — it usually works best to start with more water exercise and gradually shift the balance toward walking. The table below is one example; drop back a stage if pain increases at any point.

If pain has not eased after four weeks, or has gotten worse, the safer move is not to keep adjusting the plan alone but to get reassessed by an orthopedic or rehabilitation specialist and have the intensity re-prescribed for the joint's current condition.

Post-workout conditioning with near-infrared care

Some people reach for near-infrared (NIR) care when the knee or hip feels stiff after a water exercise or walking session. It is worth being precise about what this is: not a diagnostic or treatment tool, but a wellness aid meant to support sticking with an exercise routine over time.

The basic idea

• Cellular metabolism support: near-infrared wavelengths reach tissue beneath the skin and are understood to interact with cellular energy metabolism, an area studied under the term photobiomodulation.
• Local blood flow changes: a temporary increase in local blood flow, along with a sense of warmth, is commonly reported at the treated area.
• Post-exercise ease: used to support the feeling of relaxation in the muscles around the knee and hip after a walking or water exercise session.

Working it into a routine

When using a near-infrared healthcare device such as the CIRIUS LED Pro or Compact, a few practical notes apply.

• Hold the device 5 to 10cm from the skin, aimed at the front of the knee or the side of the hip.
• Apply for 10 to 15 minutes right after a walking or water exercise session.
• It fits best into a recovery or conditioning routine rather than an acute flare — consistency is what supports keeping the exercise habit going.
• It does not replace existing treatment or a clinician's instructions, and ongoing pain still calls for a professional evaluation.

Everyday Habits for Korean Midlife and Older Adults

Even with dedicated exercise time carved out, most of the day is still filled with ordinary movement. Adjusting a handful of joint-loading habits makes the exercise itself go a lot further.

Kneeling and Cross-Legged Floor Sitting

Ancestral rites, holiday table-setting, and floor-seated restaurants often call for kneeling or sitting cross-legged for long stretches. During a flare, use a cushion or a folding floor chair to reduce the knee-bend angle, and shift position every 20 to 30 minutes rather than holding one posture the whole time.

Squat-Style or Low Toilets

Squat-style toilets and very low seats require bending the knee past 90 degrees, which puts real strain on the patellofemoral joint (the joint between the kneecap and thigh bone). Where possible, add a raised seat attachment, and hold onto a wall or grab bar when standing up rather than relying on knee strength alone.

Stairs Without an Elevator

In a building with no elevator, daily stair use is effectively daily knee exercise whether intended or not. During a flare, carry things up in smaller loads across a few trips instead of one heavy climb, to reduce how much load lands on the knee at once.

Lifting and Carrying Grandchildren

Picking a child up off the floor by bending only at the waist, with the knees locked straight, puts significant strain on both the back and the knees. Bending the knees to lower the body first, holding the child close, then standing up using leg strength is the safer pattern for the joints.

Common myths about joint pain, sorted out

'If the knee hurts, rest is the answer'

Unless there is significant swelling or a recent injury, gentle movement within a tolerable pain range tends to support recovery better than complete rest. Prolonged inactivity weakens the muscles around the joint further, leaving it more vulnerable the next time pain flares.

'Exercising in water does not burn calories'

Sweat is just less visible in water, which makes the effort feel lighter than it is. Water walking and water squats performed at a real working intensity produce energy expenditure comparable to land-based exercise. The tradeoff is a weaker bone-density stimulus, which is one reason to pair it with walking.

'Walking alone will fix knee pain'

Walking is excellent for cardiovascular fitness and bone density, but without adequate strength in the muscles supporting the knee, the underlying cause of the pain often remains. Pairing walking with quadriceps and glute strengthening work is what actually reduces the chance of recurrence.

'Creaky, painful knees are just part of getting older'

Sound without pain is usually not a concern. But writing off pain that is disrupting daily life as simply an age issue means missing the window to address it properly. Regardless of age, persistent pain deserves an actual diagnosis and a matched exercise and management plan.