Ectomorphs – or those thin individuals characterized by smaller bone structures, and typically thinner limbs – think endurance athlete – tend to be thyroid and SNS dominant with either higher output or higher sensitivity to catecholamines –...
http://www.fitbuff.com/ectomorph-endomorph-mesomorph-wh...
A predominantly endomorphic individual typically has short arms and legs, as well as a large amount of mass on their shorter than normal frame. This hampers their ability to compete in sports requiring high levels of agility or speed. In ad...
http://www.trulyhuge.com/bodybuilding/genetic.htm
A somatotype is a numerical descriptor of overall physique in terms of body shape and composition independent of age, size or gender. The Heath-Carter somatotype rating is a description of the present relative shape and composition of the h...
http://www-rohan.sdsu.edu/%7Elcarter/kina/somatotype.ht...
It seems to me that you are a mixture of an endo/ectomorph. Certainly not a mesomorph. Endomorphs, naturally, find it, as you said “easy to lose and gain fat AND muscle.” Ecto because you said your extremeties are lean, and that is typical ...
http://answers.yahoo.com/question/index?qid=20090918201...
n The theory of W. H. Sheldon, suggesting that body structure is correlated with certain temperaments and predisposes to mental disorders.
http://www.answers.com/topic/somatotype-theory
Mesomorphs. the centre players are most likely to be mesomorphs.
http://wiki.answers.com/Q/What_somatotype_are_netball_p...
Not enough info...what is your HEIGHT? Based on your description, I would say you are an ectomorph. Ectomorphs are characterized by thin arms, long necks and practically no chest mass.
http://answers.yahoo.com/question/index?qid=20090920084...