Cycling Is Low Impact. That Doesn't Mean Low Risk
by: Chin Yi Khern, Physiotherapist, Regis Wellness
Last updated: September 10, 2026
Cycling is the only common recreational sport that locks your body into a single position for hours. Running varies joint angles with every stride. Tennis demands movement in every direction. Swimming rotates through ranges. On a bike, your spine stays flexed, your hips stay bent, your neck cranes forward, and your wrists bear weight, all without changing, for however long you ride. That sustained, unchanging position is why cycling injuries don't feel like injuries. They feel like stiffness that gradually becomes pain that gradually becomes a problem you can't ignore.
Cycling is marketed, correctly, as low impact. There's no landing force. No sudden direction changes. No collisions. The joints aren't jarred the way they are in running or court sports. For people with existing joint issues, cycling is often the exercise their physio or doctor recommends because it's gentler on the body.
But low impact doesn't mean low risk. It means the risk comes from a different source. Not from force peaks and trauma, but from sustained, repetitive loading in a fixed position, thousands of identical revolutions, with no variation, for an hour or two or three. That's a different kind of stress. And it produces a different kind of injury.
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The Sustained Position Problem
Every other popular sport involves movement variety. A runner's hip moves through a range of flexion and extension with every stride. A tennis player rotates, lunges, reaches, and recovers in multiple planes. Even walking alternates loading between sides with frequent changes in speed and direction.
On a bike, your hip cycles between roughly 35 and 110 degrees of flexion. It never fully extends. Your spine holds a flexed position for the entire ride. Your neck hyperextends to see the road ahead. Your wrists bear a portion of your bodyweight continuously. Your knees track through the same arc, in the same plane, at the same cadence, revolution after revolution.
A recreational cyclist doing a two hour weekend ride at 85 rpm completes roughly 10,200 pedal revolutions. Each one loads the same structures, in the same way, at the same angle. There's no natural variation to distribute stress across different tissues. The joints don't get the position changes that keep them healthy. The muscles that aren't involved in pedalling get no stimulus at all.
This is why cycling overuse injuries develop so gradually. There's no moment of injury. No pop, no twist, no fall. Just a slow accumulation of repetitive strain that eventually exceeds the tissue's capacity to recover between rides. By the time you notice the pain, the pattern has been building for weeks.
Your Knee Pain Is a Map
This is the most practical thing a cyclist can learn, and most cyclists have never been told it.
Where on the knee the pain shows up tells you what's going wrong, either with your setup or your body. The knee is the most commonly injured area in cycling, accounting for roughly 19.5% of all musculoskeletal complaints according to a 2025 ScienceDirect study of bike-fit services. But not all knee pain is the same, and the location is genuinely diagnostic.
Pain at the front of the knee (anterior knee pain, patellofemoral pain)
The most common. It's a dull ache behind or around the kneecap, often worse during climbs or high-resistance efforts, and sometimes accompanied by a grinding or crunchy sensation.
The usual causes:
- A saddle that's too low, forcing the knee into excessive flexion at the top of the pedal stroke and increasing compressive force on the patellofemoral joint.
- A saddle positioned too far forward, which has the same effect by shifting your weight over the front of the knee.
- This is the part bike fitters miss, weak quadriceps or an imbalanced vastus medialis (the inner quad muscle that controls kneecap tracking). A perfectly positioned saddle can't compensate for a quad that can't stabilise the kneecap properly.
Pain at the back of the knee (posterior knee pain)
The less common but distinctive. It's often felt in the hamstring tendons or the popliteal area behind the joint.
The usual cause:
- A saddle that's too high, causing overextension of the knee at the bottom of the pedal stroke. The hamstrings are stretched beyond their comfortable range with every revolution. Lowering the saddle by even 5 to 10mm often resolves it. If it doesn't, the issue is usually hamstring flexibility or posterior chain strength, not the bike.
Pain on the outside of the knee (lateral knee pain)
It typically involves the iliotibial band, the thick strip of connective tissue that runs from the hip to the outer knee.
The usual causes:
- Cleat rotation that forces the foot into a position the knee doesn't naturally track in.
- More commonly, weak hip abductors (gluteus medius) that can't stabilise the pelvis during pedalling. When the pelvis drops on one side, the IT band on the other side is stretched and compressed against the lateral femoral condyle with every revolution. This is the same gluteus medius pattern that causes IT band syndrome in runners. The IT band itself isn't the problem. The hip above it is.
Pain on the inside of the knee (medial knee pain)
The least common but often the most confusing for cyclists who can't identify a clear cause.
The usual causes:
- Cleat misalignment that pushes the knee outward during the pedal stroke, stressing the medial collateral ligament.
- Tight adductor muscles pulling the knee inward under load.
- A crank length that's too long for the rider's leg length, increasing the range of motion the knee is forced through.
The pattern is consistent. Front and back knee pain are primarily setup issues. Inside and outside knee pain are primarily body or cleat issues. All four are fixable once you know what you're looking at. A physio assessment paired with a bike-fit review covers both sides of the equation and identifies which adjustments are needed where.
The Back Pain That Builds Slowly
Lower back pain is the second most common complaint among cyclists, and its cause is almost always a combination of position and the body's inability to maintain that position.
Cycling places the lumbar spine in a sustained flexed posture. For a road cyclist in an aggressive position, that flexion is significant. For a recreational rider with upright handlebars, it's less extreme but still present. Either way, the spine is held in flexion for the duration of the ride, without the position changes that would normally prevent stiffness and creep.
We covered the concept of viscoelastic creep in our article on why your lower back hurts after sitting all day. The same mechanism applies on the bike. Sustained flexion causes the spinal ligaments and discs to gradually deform under load. After 60 to 90 minutes, the passive support structures have stretched enough that the muscles have to pick up the slack. If those muscles, primarily the deep stabilisers and the erector spinae, aren't strong enough to maintain the position under fatigue, the lower back starts complaining.
But here's the piece that makes cycling back pain different from desk-related back pain, and arguably worse for the same demographic.
If you sit at a desk all week and your thoracic spine stiffens, your hip flexors shorten, and your core deactivates, those are problems we've covered extensively. Now put that same body on a bike. You're adding more flexion on top of a week of flexion. Your hip flexors, already shortened from sitting, are locked into an even more flexed position at 70 to 110 degrees for another one to three hours. Your thoracic spine, already stiff from desk work, is asked to hold a position that demands exactly the extension and rotation it's lost. Your core, already underactive from sitting, now has to stabilise the pelvis at 85 rpm under load.
The desk doesn't just create the vulnerability. The bike reinforces it. This is why weekend cyclists who work desk jobs develop back pain more readily than daily cyclists whose bodies are conditioned to the position. The body that sits all week and then cycles on the weekend gets the worst of both worlds: the stiffness from the desk and the sustained load from the bike, with no adaptation in between.
A bike fit can optimise handlebar height and saddle position to reduce the degree of spinal flexion. But if the body riding the bike has a thoracic spine that can't extend, hips that can't open, and a core that can't stabilise, no amount of handlebar adjustment will prevent the back from aching after an hour.
Saddle Pain: The Issue Nobody Talks About Enough
Saddle discomfort is one of the most common reasons recreational cyclists reduce their riding or stop altogether. It's also one of the most under-discussed because it involves anatomy people aren't comfortable talking about.
The saddle supports your bodyweight on a very small area, primarily the ischial tuberosities (sit bones) and the surrounding soft tissue. When the saddle is the right width and angle for your anatomy, the weight is distributed across the sit bones and the discomfort is manageable, especially as the body adapts over the first few weeks of regular riding.
When something is wrong, the symptoms are hard to ignore. Numbness in the perineal area, pain at the sit bones that doesn't ease with time on the bike, chafing or pressure sores that take days to resolve, or a persistent discomfort that makes every ride less enjoyable.
The most common causes are straightforward. A saddle that's too narrow for your sit bone width concentrates pressure on the perineum instead of the bones. A saddle tilted too far forward shifts weight onto the soft tissue and forces the hands and arms to bear more load, contributing to wrist and shoulder pain as a secondary effect. A saddle tilted too far back increases perineal pressure and changes pelvic tilt in a way that loads the lower back differently.
But there's a body component too, and it's the one most cyclists overlook. If your hip flexors are tight, your pelvis tilts anteriorly (forward) on the saddle, rotating the contact point from the sit bones toward the softer perineal tissue. If your core is weak, your pelvis rocks excessively with each pedal stroke, creating friction and microtrauma instead of the stable platform the saddle is designed for. If your hamstring flexibility is limited, the pelvis tilts posteriorly and rounds the lower back, changing both the saddle contact and the spinal loading simultaneously.
Saddle pain isn't something you should just "get used to." If it hasn't settled within the first three to four weeks of regular riding, something is wrong with the saddle choice, the saddle position, or the body's relationship with both.
The Injuries You Feel Somewhere Else
Cycling produces a few injury patterns that are less discussed but remarkably common in recreational riders.
- Neck pain - On a road bike, the handlebars are lower than the saddle, which means the thoracic and lumbar spine are flexed while the cervical spine hyperextends to see the road ahead. Over an hour or two, the deep neck flexors fatigue, the upper trapezius tightens, and pain develops at the base of the skull or across the upper shoulders. This is amplified by the thoracic stiffness from desk work: when the upper back can't extend, the neck has to hyperextend further to achieve the same line of sight.
- Hand and wrist numbness - Sustained pressure on the handlebars compresses the ulnar nerve (causing numbness in the ring and little finger) or the median nerve (causing numbness in the thumb, index, and middle finger). This is known as cyclist's palsy. We covered how nerve compression produces symptoms in our article on where pain shows up versus where the problem is. In cycling, the compression is positional: too much weight on the hands, too little core stability to hold the trunk up, or handlebar position that shifts load forward.
- Achilles and foot pain - Less common than knee and back pain but present in riders who pedal with a low cadence and high resistance (grinding in a big gear). The calf muscles and achilles tendon absorb load during the push phase, and sustained high-force pedalling without adequate calf conditioning can irritate the tendon. Cleat position also plays a role: cleats positioned too far forward on the shoe increase the lever arm on the achilles with every stroke.
Why a Bike Fit Alone Doesn't Fix Everything
A professional bike fit is one of the best investments a cyclist can make. It optimises saddle height, saddle fore-aft, handlebar reach and height, cleat position and rotation, and crank length based on your body's dimensions and riding style.
But a bike fit adjusts the machine. It doesn't adjust the body.
If your hip flexors are too tight to allow full pedalling range, the fitter can raise the handlebars to reduce the hip angle. That helps, but it doesn't restore the hip mobility you've lost from sitting all week. If your glutes can't stabilise the pelvis, the fitter can adjust cleat rotation to reduce knee tracking issues. That's a compensation, not a correction. If your core can't hold your spine stable, the fitter can reduce the reach to lessen the demand. But the demand is still there, just reduced.
The cyclists who ride comfortably for years are the ones who address both sides. The machine and the body. The fit and the function. A bike fit every couple of years to keep the setup optimal. And a body that's maintained with targeted hip mobility, thoracic extension, core stability, and glute strength so that the position on the bike is one the body can actually sustain.
This is where physiotherapy adds value that a bike fitter can't. A physio assesses the body off the bike: what's restricted, what's weak, what compensations have developed from desk work and from riding. Then builds a targeted programme to address the specific deficits. Joint mobilisation for a stiff thoracic spine. Myofascial release for tight hip flexors and IT bands. Progressive strengthening for glutes, core, and the posterior chain. These are the things that make a good bike fit work long term instead of compensating for a body that's slowly getting stiffer and weaker.
What Singapore Cyclists Should Pay Attention To
A few environmental factors specific to cycling in Singapore that compound the issues above.
- Flat terrain is uniform terrain. Singapore is one of the flattest countries in the world. Road cycling here means almost no elevation change, which means no variation in muscle recruitment. Every pedal stroke loads the same muscles at the same angle. No hills to shift cadence, engage the glutes differently, or break up the monotony of the loading pattern. This repetitive uniformity accelerates overuse.
- Heat and humidity demand more from the body. Riding in 31 degree heat at 85% humidity increases cardiovascular demand, accelerates fluid loss, and affects tissue performance. Dehydrated discs are stiffer. Dehydrated tendons are less elastic. Dehydrated muscles fatigue faster. The same two hour ride in Singapore is physiologically harder than the same ride in Melbourne or London, even at the same power output.
- Indoor cycling has its own risks. Spin classes are hugely popular in Singapore. They provide a great cardiovascular workout. But the bikes are rarely fitted to the individual rider. The saddle height is approximate. The handlebar position is generic. And the competitive group environment pushes people to ride at intensity levels their body may not be conditioned for. We see a disproportionate number of knee and back complaints from indoor cyclists, often because the combination of poor fit and high intensity creates the perfect overuse conditions.
- The weekend warrior pattern applies here too. We've covered this across multiple articles, from our piece on overuse injuries in recreational athletes to our running injuries article. The same principle holds for cycling. Five days of desk work followed by a two to three hour ride creates an acute-to-chronic workload spike that your tissues may not be prepared for. Two or three shorter rides or conditioning sessions during the week would dramatically reduce the injury risk of that weekend ride.
When to See a Physio
Cycling pain follows the same traffic light framework we described in our article on exercising with pain.
- A mild ache that develops late in a ride and settles within a few hours is green. Monitor it. Consider whether a fit adjustment or a conditioning change might address it.
- A moderate pain that appears earlier in each ride, limits your performance or comfort, and lingers into the next day is amber. Modify the ride (reduce duration, lower intensity, adjust position) and see if it improves over two weeks. If it doesn't, get assessed.
- A sharp pain that's present from the start, a numbness that doesn't resolve when you change hand position, a knee pain that worsens with every pedal stroke, or back pain that's affecting your daily function off the bike is red. Stop riding and get assessed before resuming. Continuing to ride through red-light signals turns manageable problems into entrenched ones.
A sports physiotherapist can assess both your body and, in many cases, your bike position, identifying whether the issue is a fit problem, a body problem, or the combination of both that most commonly underlies cycling pain.
The Bottom Line
The bike is the machine. Your body is the engine. You can tune the machine perfectly, but if the engine has stiff hips, weak glutes, and a core that can't hold the pelvis steady, the ride will always break down eventually. The cyclists who ride pain free into their 50s and 60s aren't the ones with the most expensive equipment. They're the ones who maintain the body as carefully as they maintain the bike.
These factors increase the loading on the body but this does not necessarily mean pain will occur. Hence if you are starting to experience pain, it may be a good time to start seeking an intervention. Reach out on Whatsapp whenever you are ready and we will be there for you.
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