Most running injuries are not caused by bad luck, weak ankles or running on the wrong surface. Overwhelmingly, they come down to one thing: load outpacing your body's current capacity. Once you understand that simple idea, injury prevention stops feeling like guesswork and starts feeling like something you can actually manage. At PhysMed in Unley we work with runners of every level, from first-time park-runners to seasoned marathoners, and the same principles apply across the board.
Load versus capacity: the idea that explains almost everything
Every time you run, you apply load to your tissues — tendons, bones, muscles and connective tissue. Those tissues have a current capacity, meaning how much load they can comfortably handle right now. When the load you apply stays within capacity, your body adapts and gradually gets stronger. When the load repeatedly exceeds capacity, tissues become irritated, and over time that irritation turns into an injury.
This is why two runners can do the exact same session and only one breaks down. It is rarely about the session in isolation. It is about how that session fits with everything else, and whether the runner's capacity was ready for it. The good news is that capacity is trainable, and load is something you control.
The number one rule: progress gradually
Sudden jumps in distance, pace or hills are the most common trigger for running injuries. Tendons, bones and muscles all adapt to training, but they adapt at different rates and they need time. Bone and tendon, in particular, are slower to respond than your cardiovascular fitness, which is why it is so easy to feel "fit enough" to do more while your structural tissues are quietly lagging behind.
A sensible approach is to avoid large weekly spikes in total running load and to change only one variable at a time. If you are adding distance, hold your pace and hills steady. If you are adding speed work, keep your overall volume in check. Build in easier weeks where load drops back, giving your body a chance to consolidate the gains. Progress that feels almost boringly gradual is usually progress that sticks.
Strength is your insurance policy
Runners who include regular strength work tend to get injured less and run more comfortably. Running is essentially thousands of single-leg impacts, and strong muscles act as shock absorbers, protecting the tendons, joints and bones underneath. The most valuable areas for most runners are:
- Calves, which take an enormous share of running load and protect the Achilles
- Glutes and hips, which control the pelvis and knee with every stride
- Feet and lower legs, which form your foundation and influence everything above
You do not need to become a powerlifter. A couple of focused sessions a week, progressed sensibly over time, is enough for most runners to meaningfully raise their capacity and resilience.
Recovery is part of training, not a reward
Adaptation happens during recovery, not during the run itself. Sleep, nutrition and easy days are where your body actually rebuilds and gets stronger. Many runners who feel stuck are not under-training — they are under-recovering. Building genuine recovery into your week is one of the simplest ways to keep raising capacity without raising injury risk. This is also where active recovery tools, used sensibly, can complement a smart training plan.
Early warning signs worth respecting
Your body usually gives you a heads-up before a small niggle becomes a major problem. Watch for:
- A niggle that warms up during a run but returns or worsens the next day
- Pain that progressively worsens through a run rather than easing
- Morning stiffness localised to a specific spot
- A niggle that quietly changes how you run or makes you favour one side
Caught early, these are usually quick to settle with a short adjustment in load and some targeted work. Pushed through and ignored, the very same niggles often turn into months-long problems. Respecting early signals is not being soft — it is being smart.
Common myths worth setting aside
A few persistent beliefs trip runners up. The first is that running is inherently bad for your knees; for most people, sensibly progressed running is well tolerated and the knees adapt like any other tissue. The second is that the perfect shoe will prevent injury; footwear can influence comfort, but it is no substitute for managing load and building capacity. The third is that more is always better; beyond a point, extra mileage piled on without recovery simply raises risk without improving results. And the fourth is that pain should always be pushed through. Some sensations are fine to run with, but pain that worsens through a run or lingers the next day is a signal, not a test of toughness.
Replacing these myths with a load-and-capacity mindset takes a lot of the anxiety out of training. Instead of fearing a particular surface or chasing the latest gear, you focus on the things that genuinely move the needle: gradual progression, strength work, recovery and listening to early signals.
When to see a physio
If a niggle lingers beyond a week, keeps returning, or changes how you run, it is worth getting assessed rather than guessing. A thorough running injury assessment can pinpoint the actual cause, which is very often a load or capacity issue we can address with a clear, targeted plan. Rather than simply telling you to stop running, our approach is to work out how to keep you moving while we rebuild the area that needs it.
This reflects the wider PhysMed philosophy. Across our physiotherapy services we focus on building capacity and giving you the tools to manage your own body, so you rely less on passive treatment and medication and more on a resilient, well-prepared system. For runners, that means staying on the road or trail consistently — which, over a season, beats any single perfect training block.
If you are dealing with a recurring niggle or simply want to build mileage without breaking down, we can help. Book an appointment or call us on 0466 337 497 to arrange a running assessment and a plan built around your goals.