COMMON INJURIES AND ITS CAUSES
The most common running injuries are to the muscle or tendons. Stronger muscles are less likely to tear, and will also hold the foot in place so that tendons aren’t pulled and stretched beyond their natural limit.(source)
Unless you’re unlucky enough to have a fall, injuries tend to build up over time, as the pressure you’re putting on your body exacerbates any minor issues. Across an average year, 40-50% of runners will experience some kind of injury (source), and the figure soars to 90% for marathon runners. (source)
It tends to be the feet or knees that get injured, but that doesn’t necessarily mean that they’re the source of your problem. Physiotherapists often use simple tests of balance, like getting you to stand on each leg in turn with your eyes closed.