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. These factors arise either due to neglecting to rehab after an injury or because rehab failed to restore the anatomic part to its pre-injury state. Shoes work in the injury formula in much the same way that anatomy does. If the shoes are optimal, the margin for falling into a training error becomes larger.