The previous post laid out the history of stress, explained how stress imposes a reaction, and the difference between good stress and bad stress.
In all activities, there is always a ceiling. It can be genetical and limit maximum strength, speed, coordination in physical performance. It can be environmental or geographical. Where we live and study determines for example the quality and scope of work. It can be a time ceiling, giving us limited time to accomplish required tasks.
This maximum can be attainable after a long and hard journey and is illustrated by the red line in the graph below.