mesomorph
this refers to one of the 3 principle body types mesomorph, ectomorph, and endomorph endomorph describes a fat body type mesomorph--> muscular body type ectomorph--->thin/skinny body type
ectomorph, mesomorph, and endomorph as far as I know.
fat
A mesomorph is a specific body type characterized by a structured and muscular build with low body fat. It is one of the three main somatotypes, along with ectomorphs (lean and long) and endomorphs (round and soft). Being a mesomorph does not necessarily mean a person is neither fat nor thin, as body fat levels can vary among individuals of this body type.
Ectomorph body type is often associated with a lean and youthful appearance due to its characteristic slim build and low body fat percentage.
Will Smith is ecto-mesomorph
Arnold Schwarzenegger is a good example of a very mesomorphic body type.
I am honestly not sure... but I would assume that he is a mesomorph + endomorph
Which body type is described as having a young appearance
It should be "lean and mean". The swimmer doesn't need to have an excess of muscle, or else it will counter the stroke pattern and will mess you up. Also the swimmer doesn't need to have an excess of body fat, which reduces your hydrodynamic form. But there doesn't need to be a large absence of either muscle of fat either, or else you won't be strong enough to swim quickly, or have enough energy. The body composition should be in between these two extremes. Although if one works their core (abs) more than the typical person, it isn't counter-effective to the stroke.
It is true that a mesomorph is neither fat nor skinny.