Dr Kevin Maggs from Running Reform has a great video explaining the concept of Load vs Capacity.
"Most injuries come down to a simple equation of the mechanical load exceeding the capacity of the tissue. If the load is much higher than the capacity, there is a higher risk of injury. If you protect too much, the load goes way down and the body adapts by reducing the capacity. Ideally, we would want to keep a consistent load on the body in order to maintain a higher capacity."
Watch this great video and for more information go to https://runningreform.com/