Endomorphic
The endomorphic body type is centered around the digestive system and is easily overweight. The endomorphic person also has a visceral temperament, which means that they are tolerant, love comfort and luxury, and are extroverted—in short he or she loves food and people. Stereotype: the “jolly fat person.”
Mesomorphic
The mesomorphic body type is centered around muscle and the circulatory system and has well developed muscles. The mesomorphic person has a somatotonic temperament, and is courageous, energetic, active, dynamic, assertive, aggressive, competitive, and often a risk taker. Stereotype: the “jock” or “GI Joe.”
Ectomorphic
The ectomorphic body type is centered around the brain and nerves. These people are slim and possibly underweight. The ectomorphic person has a cerebrotonic temperament, and is artistic, sensitive, apprehensive and highly self-aware. Another way to put it is that he or she is introverted and socially restrained.