"Swimmer's Build"

[Captain.Jammer]

Okay, so I have heard the description of a guy's body as that of a swimmer's build. But I have a few questions that I am expecting some of the members here can answer.

What IS a swimmer's build? What are the characteristics of such a build?

Is a swimmer's build a build that a guy just has/is born with?

If so are such guys more inclined to take up swimming?

Or is a swimmer's build one that a swimmer acquires over time spent swimming?

Can any guy, with enough swimming, obtain a swimmer's build?

If so, can even me, a bigger guy, eventually obtain a swimmer's build?

Thanks for indulging my queries.