Somotypes

https://commons.wikimedia.org/wiki/File:Bodytypes.jpg

Somatotype is a taxonomy developed in the 1940s by American psychologist William Herbert Sheldon to categorize the human physique according to the relative contribution of three fundamental elements which he termed "somatotypes."

Sheldon noted three personalities based on their physical make-up.
Endomorph

The Endomorph is physically quite 'round', and is typified as the 'barrel of fun' person. They tend to have:

    Wide hips and narrow shoulders, which makes them rather pear-shaped.
    Quite a lot of fat spread across the body, including upper arms and thighs.
    They have quite slim ankles and wrists, which only serves to accentuate the fatter  other parts.

Psychologically, the endomorph is:

    Sociable
    Fun-loving
    Love of food
    Tolerant
    Even-tempered
    Good humored
    Relaxed
    With a love of comfort
    And has a need for affection

Does well in parapsychological experiements.

Ectomorph

The Ectomorph is a form of opposite of the Endomorph. Physically, they tend to have:

    Narrow shoulders and hips
    A thin and narrow face, with a high forehead
    A thin and narrow chest and abdomen
    Thin legs and arms
    Very little body fat

Even though they may eat as much as the endomorph, they never seem to put on weight (much to the endomorph's chagrin). Psychologically they are:

    Self-conscious
    Private
    Introverted
    Inhibited
    Socially anxious
    Artistic
    Intense
    Emotionally restrained
    Thoughtful

Does not do well in laboratory ESP tests.

Mesomorph

The mesomorph is somewhere between the round endomorph and the thin ectomorph. Physically, they have the more 'desirable' body, and have:

    Large head, broad shoulders and narrow waist (wedge-shaped).
    Muscular body, with strong forearms and and thighs
    Very little body fat

They are generally considered as 'well-proportioned'. Psychologically, they are:

    Adventurous
    Courageous
    Indifferent to what others think or want
    Assertive/bold
    Zest for physical activity
    Competitive
    With a desire for power/dominance
    And a love of risk/chance

Does well in laboratory ESp tests.

So what?

Psychological profiling based on anatomical features is generally not considered to be reliable these days. Nevertheless, such patterns do have some level of interest, and old theories are often ingrained in society, as well as being based on some form of observation.

The best approach is to use this as a test. When you meet a person who seems to fit in with the physical characteristics above, be curious to see if they also fit into the psychological profile. If it all works as predicted, then well and good (it may be that they are actually in a self-fulfilling prophesy, where they fit themselves to the appropriate model). Otherwise, look elsewhere for ways to understand the person.

Sheldon's original work included attempts to characterize criminals (in the style of Lombroso's original work in this area). Unsurprisingly, he found that a number were muscular mesomorphs, as violent crimes are likely to be carried out by strong men. The trap beyond this is to assume that all mesomorphs are criminal in nature. This is not unlike the work that 'proved' women to be less intelligent than men because they have smaller brains!

http://changingminds.org/explanations/personality/sheldon_personality.htm

Italicized info from Mysteries of Mind, Space and Tine, Vol. 20, Pg. 2393