While it may be true that there isn’t a single biological stimulus (That there is only one is just a theory. That there is not only one is also just a theory.), the objective of espousing inroad is not to use it as a descriptive theory of the biological process.
Inroad is actually far more practical than a mere theory. It is what we do in practice as a committed course of action to achieve health enhancements.
Inroad is a measure of a subject’s intent and engagement of the appropriate structures. It reveals what these muscles no longer possess in terms of momentary strength.
Therefore, inroad serves to qualitatively measure performance. The higher the quality we possess, the less the global expense. This permits greater and faster recovery in preparation for the next workout.
Most in the HIT community confuse inroad with global fatigue. Global fatigue (outroad) is one of many causes in mechanical failure, and its confusion often spawns the need for protracted recovery periods between workouts.
Inroad includes all of the multi-factorial ingredients of the yet-undefined biological stimulus. Our faithful study of inroad represents our quest to discover how quickly we can safely stimulate strengthening without wasting resources.
Can anyone offer what endeavor doesn’t improve qualitatively with more concentration?