The short answer: it comes down to intelligent training. Programming is the number one factor. A customized training program, built around a runner’s current fitness level, monitored by someone other than the runner, and adjusted as fitness progresses, is what actually prevents injury. Workouts should be based on paces determined from current races or time trials, not guesswork. Gradual progression matters more than any single workout. The individual sessions need to fit together like pieces of a puzzle, built around the main thing, which is easy running, with the long run as the most important workout of the week. Keep the main things the main things, and injury risk drops dramatically. Here’s the physiology behind why that approach works.
Table of Contents
Each of these is unpacked with its source below:
Because their training isn’t precisely matched to their current fitness. Roughly 66% of runners get injured in a given year, and that number is almost certainly low, since a meaningful share of runners never report an injury at all.
That’s not bad luck, and it’s usually not one bad workout. It’s paces and volume set by a generic template, or by feel, instead of by a specific calculation of where that runner actually is. Research from Aarhus University tracking 5,205 runners and 588,071 real training sessions backs this up directly: runners whose single run exceeded their longest recent run by even 10 to 30% saw injury rates jump 64%, and more than doubling that distance more than doubled injury risk. The problem isn’t effort. It’s progression that isn’t matched to where the runner actually was.
Nearly every runner who comes to us with a long injury history was training on a generic plan, a cookie-cutter schedule, or no plan at all. Reviewing a new runner’s injury history and training background is one of the first things we do, and the pattern is remarkably consistent.
Once that runner is placed on a program that’s genuinely custom, monitored, and adjusted as fitness improves, training Hard, Smart, and Consistent, the injuries typically stop. Not because of added strength work or stretching. Those can help at the margins, but they’re band-aids on the real issue. The research squares with this: across sports in general, strength training has strong evidence for injury prevention, yet a 2024 meta analysis of endurance runners specifically found exercise based prevention programs produced no significant reduction in running injury risk. For runners, the fundamental fix is the programming itself.
Every training block has to be Hard enough to create progress, Smart enough to match that runner’s actual fitness, and Consistent enough to keep adjusting as fitness changes. Skip any one, and the other two stop working.
Training hard without training smart is one of the most common ways runners get hurt. Running easy days too fast, or matching a group’s pace instead of your own, is still Hard without being Smart.
Smart means every pace in your plan is calculated from your specific, current fitness, not a vague intensity label. “Run by effort” sounds reasonable, but in practice it’s often an excuse to skip the actual calculation.
This is the entire premise behind customized marathon training: a plan built from your numbers, not the group’s.
A recent time trial or race result, adjusted for how well it was executed. A finish time alone isn’t a clean read on fitness.
That adjusted number, not a goal time and not a guess, is what should set every pace in the plan.
Most runners run their easy days too fast, and it’s the single most common fix in coaching. Since easy running makes up the majority of marathon training volume, getting this pace wrong undermines the whole plan.
The goal isn’t just slower. It’s landing in the specific range where aerobic fitness actually improves, calculated from that runner’s current fitness, not a feel-based guess.
Race day pacing should come from your current fitness, shown by recent time trials, not an aspirational goal time. Great fitness executed with the wrong pacing strategy still produces a result that looks worse than the runner actually is.
This is also why race pace workouts are used sparingly in a well-built plan. Training is meant to raise fitness, not rehearse a hoped-for number. Every workout type, easy runs, tempo, VO2 max, long runs, should be run at paces set by current fitness, and race pace should be the output of that fitness, not the input to training.
Pain that shows up at the same point every run, changes your gait, or is still there the next morning. These are not things to push through.
An extra rest day is never the wrong call. Losing a week to caution beats losing eight weeks to injury.
The programming is what prevents injury, not supervision. A runner can train inside a group and still injure themselves if they abandon their own calculated paces to match the pack.
Being part of a group doesn’t mean running the group’s pace. It means being humble enough to say, today is an easy day, I’m sticking to my own plan, or, I’m ready to push and this workout can be faster for me. A community worth training with respects that distinction and values a runner’s individual programming as much as the runner does.
Runners who sacrifice their own paces for the sake of keeping up lose both the fitness gain and the community, since an injury takes them out of both. That’s the actual failure mode behind a lot of group-run and group-class injuries: training at someone else’s pace instead of your own. That’s also the core reason new runners get pointed toward how to train for a first marathon without burning out: burnout and injury both come from training that isn’t precisely matched to the individual.
What percentage of runners get injured?
Roughly 66% of runners are injured in a given year, and the real number is likely higher since many injuries go unreported.
Does adding strength training or stretching fix chronic running injuries?
Usually not on its own. Most runners with a long injury history get better once their programming is fixed, meaning custom, monitored, and adjusted paces and volume, not from adding extra exercises on top of the same flawed plan.
Why do group runs sometimes cause injury?
Because everyone runs the same pace regardless of individual fitness. A runner behind the group’s fitness level ends up training too hard for their current capacity.
How do I know what pace to run my easy runs at?
It should be calculated from your current fitness, typically from a recent time trial or race adjusted for pacing and fueling errors, not a feel-based guess.
Why don’t I train at my race pace goal?
Training is meant to build fitness, not rehearse a hoped-for number. Workouts should be run at paces set by your current fitness, and race pace should be the result of that fitness, not the target during training.