Instead the point at which a training error initiates an injury or illness is quite individual. Seasoned runners generally learn by trial and error over time what training volume suits them best. The same holds true for the relative amount of intensity in their training program, how frequently they can race, and how rapidly they can change their training volume or intensity as they progress through their training microcycles and mesocyclyes. However, when the recovery component is inadequate, things go bad. Every one of the training errors cited invariably violates the recovery component of the training principle in some fashion.
Anatomic factors can also be responsible for running injuries.
These faults tend to magnify the predisposition to injury when combined with a training error. The more serious the anatomic deficiency, the smaller the margin for falling into a training error becomes. Anatomic factors work in another way. Particular types of anatomic factors tend to predispose a known array of possible injury manifestations. Acquired anatomic factors usually are represented by loss of flexibility, loss of strength, or malalignment as a result of a prior injury.