Swimming for Back Pain and Joint Pain: What to Change in the Water

Swimming is the exercise almost every GP, physiotherapist and well meaning relative recommends the moment your back starts playing up. It is also the exercise a surprising number of people quietly abandon within a month, because the thing that was supposed to loosen them off left them stiffer getting out of the car on Tuesday than they were on Monday. That is rarely a reason to stop. It is usually a sign that the water is doing its job and the stroke is not. Get your position right and the pool becomes the one hour in your week when your spine is not carrying you around.

By the Swim Design Space Team  ·  August 2026  ·  13 min read

Why water works on days when land does not

Swim England puts the number of people in the UK living with arthritis or another musculoskeletal condition at more than twenty million. That is roughly one adult in three carrying a back, neck, hip, knee or shoulder that complains about being asked to do very much. For a large share of them, the pool is the only place regular exercise is realistic.

Four things happen to your body the moment you get in, and each one matters for a sore joint.

• Your weight mostly disappears. Stand in water up to your chest and you are carrying about a quarter to a third of what you weigh on land. Float horizontally with your neck submerged and the figure drops close to a tenth. Nothing you can do in a gym unloads a lumbar spine or an arthritic knee that completely.
• Resistance arrives without impact. Water pushes back roughly twelve times harder than air, so even a slow, unhurried length is doing genuine strengthening work. There is no landing, no jarring and no shock travelling up through the heel into a hip.
• Warmth loosens things off. A public pool sits at about 28 to 30 degrees. Hospital hydrotherapy pools run considerably hotter, between 33 and 36 degrees, precisely because heat lets tight muscle let go before you ask it to move.
• Pressure works on swelling. Being submerged squeezes gently and evenly on everything below the surface, which encourages fluid away from puffy joints while you exercise them.

There is also the plain arithmetic of activity. The NHS asks adults for 150 minutes of moderate exercise a week plus two strengthening sessions. If your back rules out running and your knees rule out most classes, three half hour swims covers the cardiovascular half and a fair chunk of the strength half in one go. Our piece on the muscles swimming actually works breaks down where that strength lands.

The part nobody mentions: swimming is not automatically kind to your back

Here is the honest version, and it is the reason this article exists. Being horizontal and weightless is good for a painful spine. Repeatedly arching that spine while horizontal and weightless is not. Every swimming stroke asks your lower back to extend to some degree, and two of the four ask for a great deal of it. If you already have a lower back that objects to standing at the kitchen counter for twenty minutes, an hour of arching in the pool is not rehabilitation. It is the same provocation in a nicer setting.

This is why the advice to just go swimming so often disappoints. It treats swimming as one activity when it is really four quite different ones, performed at wildly different standards of technique. A physiotherapist recommending the pool is picturing a level, relaxed swimmer moving efficiently. What frequently turns up is a head up breaststroke with the chin permanently above the waterline, held for forty minutes, which loads the exact tissue that hurts.

The good news is that almost everything in that sentence is fixable, and none of the fixes require you to be a good swimmer. They require you to be a deliberate one.

The head up habit, and why it hurts

If you change one thing after reading this, change where you are looking. Head position is the single largest cause of back pain in adult swimmers, and it is almost invisible to the person doing it.

Your body works like a seesaw in the water. Lift your head to keep your face dry or to see the far wall, and your hips and legs sink at the other end. Now your torso is running downhill instead of lying flat, so your lower back has to hollow to keep your legs anywhere near the surface. Do that once and nothing happens. Do it sixty times a length for half an hour, twice a week, and you have effectively booked yourself a lumbar extension class.

Three quick ways to tell whether this is you:

• You can read the clock on the far wall while you are swimming. If you can see ahead of you, your head is up.
• Your hair stays mostly dry, or the water sits somewhere around your forehead rather than your crown.
• You finish a swim with a tight, hot band low across your back, but your shoulders and legs feel fine.

The correction is not complicated, but it does feel wrong for the first few sessions because you lose your view of the pool. Look straight down at the tiles beneath you, not forwards. Let the waterline sit across the crown of your head. Breathe out steadily through your nose while your face is in, so you only need a short sip of air rather than a long panicked gulp. Most people who breathe badly are actually holding air in, and that is what forces the big head lift. Our guide to breathing technique for beginners walks through the timing properly.

One small piece of kit removes half the temptation. If you are squinting through fogged or tinted lenses in an indoor pool, you will instinctively raise your head to see. A clear lens such as the FINIS Alliance gives you enough vision looking down that you stop needing to look forwards. It sounds like a small thing. It changes people's body position within a session.

Which stroke suits which problem

There is no single best swimming stroke for back pain, because backs, necks, shoulders and knees all want different things. What follows is how we set people up poolside, and it holds true for most of the adults we coach.

A pattern comes out of that table. The two strokes people default to in a public pool, head up breaststroke and head up front crawl, are the two least suited to a sore back. The stroke most adults quietly avoid, backstroke, is usually the best one available to them. If you are unsure how each one is meant to look, our guide to the swimming strokes covers the mechanics of all four.

Lower back pain: what to change

Lower back complaints are the most common thing we hear about from adult swimmers, and they follow a predictable script. The swim itself feels fine. The ache arrives an hour or two afterwards, or the next morning, and settles across the belt line.

Work through these in order. Most people find their answer in the first three.

• Start with backstroke, not front crawl. Lying on your back with your ears in the water and your eyes on the ceiling puts your spine about as flat as it gets in swimming. Keep your chin gently tucked rather than thrown back, and stop your tummy dropping by thinking of the belly button pulling very slightly towards your spine. Twenty five metres at a time is plenty at first.
• Drop the head on front crawl and shrink the kick. A big, splashy kick from the hip drives lumbar extension. A small, quick kick from the knee down, with relaxed ankles, does not. Aim to make less noise, not more.
• Stop swimming head up breaststroke entirely for a few weeks. If breaststroke is the only stroke you have, learn to put your face in and glide. The head goes down between every stroke, not once every three. Our breaststroke technique guide covers the timing that makes this feel natural rather than awkward.
• Use fins to hold your hips up. A short bladed training fin lifts the legs towards the surface, which removes the arch without you having to think about it. It also lets you swim slowly with good position instead of quickly with bad position. The FINIS Positive Drive fins are short enough to keep the kick honest rather than turning it into a leg press.
• Break the swim into repeats. Four lots of fifty metres with twenty seconds of rest between them is far better tolerated than two hundred metres unbroken, because your position falls apart in the last third of a long swim and that is where the damage happens.
• Do the land work. Water is where you move without pain. It is not where you build the hip and trunk strength that stops the pain coming back. Ten minutes of simple work at home matters, and our notes on dryland training for swimmers is a sensible starting point.

One caution on the pull buoy, since it gets recommended constantly for bad backs. Wedging a float between your thighs does raise your hips and take the kick out of the equation, and for some people that genuinely helps. It also transfers all of the work to your arms and shoulders, so if your shoulders are also grumbling you have simply moved the problem. Use it for a couple of repeats, not for the whole session.

Neck and upper back: what to change

Necks have one specific enemy in swimming, and it is not the swimming. It is the turning. Front crawl asks you to rotate your head to one side, usually the same side, every two or three strokes. Over a thousand strokes that becomes a lot of repetition through a joint that may already be irritable, particularly if you spend your working day at a desk.

Four changes, in the order we would introduce them:

• Rotate your whole body, not just your head. Your head and shoulders should turn together, as one unit, so that the movement comes from your trunk rolling rather than your neck twisting. If your shoulders stay flat while your chin swings, that load is going entirely into your neck.
• Keep one goggle in the water when you breathe. Turning far enough to bring both eyes clear of the surface is roughly twice the rotation you need. Aim to look sideways at the lane rope, not upwards at the ceiling.
• Breathe to both sides. Alternating every three strokes halves the repetitions on your dominant side and evens out the whole stroke. It feels clumsy for a fortnight and then it does not.
• Use a snorkel and take the rotation out completely. This is the single most effective intervention we know for a swimmer with neck trouble.

That last point deserves more than a bullet. A centre mount snorkel sits over the middle of your face and lets you swim front crawl with your head completely still, facing straight down, breathing normally. No turning, no lifting, no holding your breath. For a stiff neck it removes the aggravating movement while leaving the exercise intact, which is a rare thing in rehabilitation of any kind. It also happens to be the fastest way to fix the head up habit from the previous section, because you physically cannot lift your head and keep breathing.

The FINIS Stability Snorkel is the one we hand to adults most often, because the head bracket keeps it steady when you roll and it does not clatter about. If you want something simpler, the Original Swimmer's Snorkel does the same core job, and the full snorkel range covers the sizes in between. Give yourself two or three sessions to get used to breathing through it before you judge it. Almost everybody hates the first five minutes and then refuses to swim without it.

Shoulders: what to change

Shoulder pain is the one problem on this list that swimming can create as easily as it can ease. The shoulder is a shallow, mobile joint held together mostly by soft tissue, and front crawl asks it to go overhead somewhere north of six hundred times an hour. Get the angles slightly wrong and tissue starts getting pinched at the top of every stroke.

The technical faults that cause it are consistent enough that you can check yourself against them.

• Crossing the midline. Your hand should enter the water roughly in line with the same shoulder. If it reaches across the centre of your body, the joint is being asked to work at an angle it does not like.
• Thumb first entry. Slicing the hand in thumb down rolls the shoulder inwards at exactly the wrong moment. Enter flat, fingertips first, with the palm facing the bottom of the pool.
• Reaching from the shoulder instead of the shoulder blade. The extension should come from your whole side lengthening as your body rolls. Yanking the arm forwards from a flat, square chest jams the joint.
• Dropping the elbow on the pull. If your elbow sinks below your hand as you pull back, you lose all the power and put the strain onto the joint capsule instead of the big muscles of your back.

Alongside the technique, cut volume before you cut effort. A sore shoulder tolerates six short repeats far better than one long swim, because the damage is cumulative within a session. Swap in some backstroke, which uses a different range, and some head down breaststroke, where the arms never leave the water. Kicking on your side with one arm extended is another good option that keeps you moving without any overhead work at all.

Now the part that costs us a sale, and we would rather say it than not. If your shoulder is the thing that hurts, put the paddles away. Hand paddles increase the surface area you are pulling against, which increases the load through the joint on every stroke. They are excellent tools for a healthy swimmer building strength and a reliable way to turn a niggle into a proper injury. The same goes for the pulling ankle strap. Come back to both when you are pain free for a month. If you want to keep working on your catch in the meantime, the training gear range has gentler options, and a snorkel plus slow, deliberate swimming will teach you more than paddles ever did.

Knees and hips: what to change

Knees are where the standard advice goes most obviously wrong. People with worn knees are told to swim, they swim the stroke they know, and the stroke they know is breaststroke. Breaststroke has the one kick in all of swimming that genuinely stresses a knee.

The reason is the shape of the movement. The whip kick asks the lower leg to swing out and round while the knee is bent and the foot is turned outwards. That combination pulls on the ligament running down the inside of the joint. Sports medicine has recognised the pattern for decades under the plain name of breaststroker's knee, and it turns up in competitive swimmers with perfectly healthy cartilage. If your cartilage is already thin, the sums are worse.

What to do instead:

• Switch to a flutter kick. The straight up and down kick of front crawl and backstroke moves the knee through a small, straight arc with no twisting at all. For most sore knees it is comfortable from the first length.
• If you keep breaststroke, narrow it. Keep your knees no wider than your hips as they draw up, rather than splaying them out to the sides. A narrower kick is both kinder to the joint and, as it happens, faster.
• Reduce the number of kicks, not the distance. Adding a long glide after each kick halves how many times you load the knee for the same length. Nobody has ever been thrown out of a pool for gliding.
• Use fins for the same reason as your back. Fins let a stiff hip or knee produce propulsion with a much smaller range of movement, so you cover the distance without forcing the joint through angles it does not have.
• Try walking widths first. Ten minutes of walking in chest deep water before you swim warms the joints under about a quarter of your body weight. It looks unremarkable and it works.

Stiff hips respond to much the same approach. Front crawl and backstroke ask the hip for a modest, straight range. Breaststroke asks it to open outwards under load, which is the movement most people with hip arthritis have lost first.

Kit that helps, and kit that quietly makes it worse

You do not need much. But two or three items genuinely change what your body is doing in the water, and one or two popular ones work against you when you are sore.

On the kickboard point, the way you hold it matters more than which one you buy. A board designed to be held with arms straight out in front, like the FINIS Alignment kickboard, encourages a long flat body rather than the propped up, chin out position most people fall into with a standard rectangular float. Add a snorkel and put your face in the water and kicking becomes one of the better things you can do for a sore back rather than one of the worse.

If you are buying in order, get the snorkel first, the fins second and a clear pair of goggles third. Between them they hold your head still, lift your hips and remove the reason you were looking up in the first place, which covers the three faults behind most swimming related back pain. A pacing aid such as a tempo trainer is a worthwhile fourth once the basics are in place, because holding a rhythm you chose stops the session running away from you halfway down the pool. Everything mentioned here sits in our adult swim gear range, and the wider swimming kit guide covers fit, sizing and care in detail.

A first session that will not set you back

The most common mistake on a comeback swim is not technical. It is doing thirty lengths on day one because thirty lengths used to be easy, then spending three days regretting it and concluding that swimming does not suit you. Here is a first session that leaves something in the tank on purpose.

That is roughly half an hour and around three hundred metres of actual swimming. It will feel like far too little. Do it twice, a few days apart, and only then add distance, and add it in one place at a time. If you are coming back after months or years away, our guide on returning to swimming after a break covers the rest of the rebuild.

Then apply the rule that governs everything else. Judge a session by how you feel the next morning, not by how you feel walking out of the changing room. Mild tiredness and slightly achy muscles are the right answer. Pain that is worse than before you went in, or that is still worse forty eight hours later, means the session was too much or the stroke was wrong. Halve it and change one thing.

Pool choice, water temperature and timing

Where and when you swim makes more difference to a painful joint than most people expect.

Temperature. A standard public pool holds about 28 to 30 degrees, comfortable for lane swimming and slightly cool if you are moving carefully and stopping a lot. Hydrotherapy pools run at 33 to 36 degrees, and the difference is obvious within minutes if your muscles guard around a sore joint. If a local leisure centre has a warmer teaching pool or a learner pool, and you are working on technique rather than lengths, that is usually the better room to be in. Cold water is not the enemy exactly, but stiff joints in a chilly pool tense up, and tense muscle is what turns a manageable ache into a bad evening.

Lane traffic. A busy lane forces you to look up, dodge, stop suddenly and swim at somebody else's pace. Every one of those is bad for your position. A quiet hour is worth more than a warm pool. Weekday mid mornings and early afternoons are usually the emptiest, and many centres run designated slow lanes or adult only sessions that are far more pleasant to rebuild in. Some swimmers find women only sessions give them the calm space they need.

Time of day. If you wake stiff and loosen up as the day goes on, an evening swim will feel dramatically better than a 6am one. If you stiffen up as the day wears on, do the opposite. This sounds obvious and almost nobody applies it, because they pick a swim time based on the diary rather than the body.

Getting in and out. Ladders are the worst part of the pool for a bad knee, hip or back. Use the steps, use the handrail, and sit on the poolside and lower yourself in rather than climbing down backwards. Nobody is watching, and if they are, they are wrong to.

How to tell it is actually working

Progress with a long standing joint problem is slow and lumpy, and it rarely shows up as pain simply going away. Watch for these instead, over six to eight weeks of swimming twice a week.

• The soreness the day after a swim shrinks, then disappears, before the underlying pain changes at all. This is usually the first thing to shift.
• You can swim further before your position falls apart. Distance to technical failure is a better marker than distance overall.
• The ordinary things get easier first. Getting out of a car, standing at the sink, carrying shopping in from the boot. Pool improvements show up in the kitchen before they show up in your times.
• Your bad days get shorter rather than less frequent. Flare ups will still happen. They should resolve faster than they used to.
• You stop thinking about the joint while you swim. That is the one everybody notices last and it is the best sign of the lot.

Keep a two line note after each swim: what you did, and how you felt the next day. Six weeks of that tells you more about what your body tolerates than any general article, this one included.

When to stop and get it looked at

Everything above is coaching advice about how to move in water. It is not a diagnosis and it does not replace one. Get your problem assessed by a GP or physiotherapist before you build a swimming routine around it if any of the following apply: pain that travels down a leg or arm, numbness, pins and needles or weakness, pain that wakes you at night, a joint that is hot or visibly swollen, pain that started after a fall or an accident, or any back pain that has come on suddenly and severely.

If you are already under a physiotherapist, take this article to them. Most will happily tell you which of these changes fits your particular problem and which does not, and that conversation is worth more than anything we can write for a general audience.

Frequently asked questions

Is swimming good for lower back pain?

For most people, yes, but it depends heavily on the stroke. Water removes the great majority of the load from your spine, which is why movement that hurts on land often feels fine in the pool. The benefit disappears if you spend the session arching your lower back, which is what head up breaststroke and butterfly both do. Backstroke and a flat, face down front crawl are the two safest places to start.

Which swimming stroke is best for a bad back?

Backstroke. Lying on your back keeps the spine closer to neutral than any other stroke, there is no head lifting and no rotation to breathe, and the kick is small and straight. Front crawl comes a close second provided you keep your eyes on the bottom of the pool and your kick contained.

Why does my back hurt after swimming?

Almost always head position. Lifting your head to breathe or to see ahead drops your hips, which forces your lower back to hollow to keep your legs up. Repeated across a few hundred strokes that becomes a genuine load. Put your face in the water, breathe to the side rather than to the front, and swim in short repeats instead of long unbroken distances.

Is breaststroke bad for your back and knees?

Head up breaststroke is hard on the lower back because the chin never drops and the spine arches on every cycle. The kick is separately hard on the knees, because it swings the lower leg out and round while the joint is bent, which strains the ligament on the inside. Breaststroke with your face in the water and a narrow kick is far kinder on both. If your knees are the problem, switch to a flutter kick instead.

Can I swim with arthritis in my knees or hips?

Yes, and it is one of the few forms of exercise that stays available as joints wear. Buoyancy takes most of the weight off, and the resistance builds the muscle around the joint without any impact. Choose front crawl or backstroke over breaststroke, warm up by walking in chest deep water, and use short fins so a stiff joint can produce propulsion through a smaller range.

How often should I swim if I have back or joint pain?

Twice a week is the usual sweet spot to begin with, with at least one full day between sessions. Two well judged half hour swims beat one long weekend session by a wide margin, because consistency is what changes tissue and long sessions are where technique falls apart. Build to three a week only once two are comfortable.

Does a snorkel really help neck pain?

It helps more than anything else we recommend. A centre mount snorkel lets you swim front crawl with your head still and facing straight down, so the repeated rotation that irritates a stiff neck is removed entirely while the exercise stays intact. Expect the first few minutes to feel strange, and give it two or three sessions before you decide.

Should I use a pull buoy if my back hurts?

In small doses. It lifts your hips and takes the kick out, which flattens the spine and suits some people well. It also puts every bit of the work through your arms and shoulders, so it is the wrong choice if your shoulders are sore too. Use it for a couple of repeats within a session rather than for the whole swim.

What water temperature is best for stiff joints?

Warmer than a standard lane pool if you can find it. Public pools sit around 28 to 30 degrees, while hydrotherapy pools are kept at 33 to 36 degrees because warmth lets guarded muscle relax before it is asked to move. A leisure centre teaching pool or learner pool is often a few degrees warmer than the main tank and is a good compromise.

How long before swimming makes a difference to my pain?

Give it six to eight weeks of swimming twice a week before you judge it. The first change is usually that the day after soreness shrinks, then that you can swim further before your technique sags, then that everyday movements like getting out of a car get easier. Underlying pain levels tend to shift last.

Nobody can see their own body position in the water, which is why so many people swim for months with a fixable fault and conclude that swimming is not for them. A coach standing at the side spots it in about two lengths. We work with adults across Cheltenham, Gloucester and Blakeney, including plenty who arrive carrying something sore, and our adult lessons run at whatever pace your body allows. If you would rather work one to one, our comparison of private and group lessons for adults explains the difference. Book a class and bring the back you have got.