What is intensity? It is many things but essentially it is the ability to perform without distraction - to play with singleness of purpose. It is that intangible that enables players and teams to play beyond their abilities and consistently come up with the "Big Play". It involves 100% effort at all times.
It is the maximum exertion of ones physical and mental strengths from the beginning to the end of a given task.
Although closely allied with aggressiveness and competitiveness, intensity goes one step farther. It requires a combination of concentration, alertness, determination and desire. It is not innate but is aquired through constant mental and physical dedication.