In ayurvedic medicine, physical attributes of the body are viewed as being made up of the 5 elements: ether, air, fire, water and earth. Vata (air + ether), Pitta (fire + water) and Kapha (water + earth) are the physical expressions of the elements, each representing a collective of different functions within the physiology. Every person has what is known as a "constitution" or body type based off of a predominance of a particular dosha.
Contrary to much of the mainstream understanding of the constitution, most people are dual doshic - having the influence of the primary body type (dosha) and a secondary body type. In some cases there are individuals who are tri-doshic, having equal influence of all 3 of the doshas. While not common, it goes to say that the mainstream approach to the ayurvedic constitution and therefore the treatment of imbalance is 1 dimensional at best.
This deeper understanding of the doshas and body type constitution allows us to have a clearer picture of imbalance tendencies, and a more precise method of treating and correcting imbalance without aggravating the other doshas. With that said, just because someone is of a particular constitution does not mean that their imbalances are solely due to their constitution. Any number of factors can create imbalances in any of the doshas, making it imperative that a practitioner is competent enough to differentiate between body type and the current doshic imbalance someone is dealing with.
There is no one size fits all method to correcting imbalance, every individual is unique in constitution, imbalance as well as factors contributing to imbalance. Fortunately, through the deeper understanding of the doshas and origin of imbalance, ayurvedic medicine offers a streamlined, holistic and common sense based approach to healing that empowers people to become aware of their own mind body connection.