Respuesta :

Una persona que 'nada bien' es una persona que tiene la habilidad y destreza para nadar en el agua.

A person who 'nada bien' is a person who has the ability and skill to swim in the water.

UvU
Well “Quien es una persona que nada bien” in English is Who is a person who can swim well...Which is basically a basically a swimmer/life guard (in Spanish it’s either a nadador/Salvavidas