Ectomorph

[Merna]

The hard [gainer] of the fitness world since they have a hard time building muscle although it is not impossible.
Theyre naturally small built with long, lightly muscular limbs. The have a fast metabolism so the can stuff their faces without putting on weight.
To gain muscle they need to eat alot and do [heavy weight] training, its advised that they avoid cardiovascular activities since cardiovascular activities [burn fat]

[Mark Zuckerberg]

An individual having [a lean], slightly [muscular] body build in which [tissues] derived from the embryonic ectoderm predominate.

[Ernesto]

A person with a lean and delicate build of body.

[Jason Yan]

Scrawny individual who has a difficult time putting on mass or gaining weight. Often used as a condescending term among weight-lifters to describe skinny, and thereby weaker, males. In the [bodybuilding] terminology, the antonym of ectomorph is [endomorph] - which is a [fatter] or heavier set individual who conversely has a difficult time losing weight.

[Jessica]

Ectomorph traditionally refers to a person who has a fast [metabolism] and [little fat]. However, it is more commonly used by those who have little muscle as an excuse. Many [skinny people] would call themselves ectomorphs or hardgainers but in actual fact they just dont eat enough.