Every runner wants to run further, and the temptation to add distance quickly is strong, especially when fitness is improving and the runs feel good. But most running injuries are not caused by a single bad step. They come from a quiet pattern: a little more this week, a little more next week, and then a shin, knee or Achilles tendon starts complaining. Building mileage safely is mostly about patience and structure.

The classic guideline is to increase your weekly distance by no more than about 10 percent per week. If you run 20 kilometres this week, run no more than 22 next week. This gives your tendons, bones and joints time to adapt, which they do more slowly than your heart and lungs. You can feel ready for more long before your body actually is, and that gap is where injuries live.

The 10 percent rule is a guideline, not a law. Some runners can handle faster increases, especially if they have years of base fitness, while others need slower progress. The principle behind it matters more than the exact number: increase gradually, hold the new level for a week or two before increasing again, and back off at the first sign of persistent pain rather than pushing through it.

Most of your running should feel comfortable and conversational. A common structure is to keep about 80 percent of your weekly running easy, with only 20 percent at a harder effort. Easy running builds the aerobic base that supports everything else, and it does so with far less injury risk than hard running.

Your long run should grow gradually too, and it should not exceed about a third of your weekly total. A sudden jump in long-run distance is one of the most common causes of injury, because the body is not prepared for the extended load. Build the long run by a kilometre or two at a time, and take a recovery week every third or fourth week, where you cut total distance by about a third.

Strength training is one of the most effective injury prevention tools available to runners. Two short sessions a week, focused on calves, glutes, hips and core, give your body a buffer against the repetitive impact of running. Calf raises, split squats, hip bridges and side planks are a solid starting set.

Sleep and nutrition matter just as much. Tired, under-fuelled runners get injured more often, because recovery is when adaptation happens. Learn the warning signs that mean stop, not push through: pain that changes how you run, pain that is worse at the start of a run and does not ease, or pain that lingers the next morning. Resting for a few days is always cheaper than recovering from an injury for months.

Another habit that protects runners is to vary the surfaces you run on. Roads, trails, grass and tracks all load the body slightly differently, and mixing them spreads the stress rather than concentrating it in one place. Trail running is especially kind in this regard, because the varied terrain forces small changes in stride with every step, which reduces repetitive strain. If you normally run on pavement, adding one trail or grass run per week can make a noticeable difference to how your legs feel. Similarly, varying your routes and your pace keeps the body adapting rather than settling into a single pattern, and that variety is one of the simplest forms of injury prevention available.

Building mileage safely is a matter of patience: increase by about 10 percent a week, keep most running easy, take regular recovery weeks, and add strength work. Your body will adapt if you give it time, and the miles will come without the injuries.