I constantly see runners working on their core. They do planks. They do sit ups. They do a terrifying exercise because they saw it on the internet. They all hear that they need a strong core, so they strive to achieve it!
As a clinician, I also see a number of non-runners, many of whom have heard the same thing. Build your core. Sit with better posture. Both groups typically have a misunderstanding of what this means. In fact, I think most of us have struggled through the years at exactly what this means.
Posture is one of those things that gets talked about endlessly, but few truly understand what it means. We constantly hear, sit up straight, stand up tall, but the fact of the matter is, this isn’t what good posture means!