06/10/2026
Running doesn't destroy your knees. Ramping up too fast does.
This comes up constantly with runners — especially when they're coming back from time off, building toward a race, or just getting back into a routine after a busy stretch. The mileage goes up faster than the body can keep up with, and something starts to hurt. Then running gets the blame.
Your knees, your shins, your hips, they can all handle a lot more than people think. The key word is "adapt."
Your body adapts to the stress you put on it, but it needs time to do that.
Bone, cartilage, tendons — they all adapt at different speeds, and they're almost always slower than your fitness. So your cardio feels fine, your legs feel fine, and meanwhile the structures underneath are quietly falling behind.
When you build mileage faster than your body can adapt, something gives. That's not running being bad for your knees. That's your training plan outrunning your body's ability to keep up.
The fix isn't to run less. It's to build smarter and to understand where your body actually is before you ask more of it.
If you know a runner who always gets hurt when they start building again, send this to them.