Original Word: γυμνάζω
Part of Speech: Verb
Transliteration: gumnazó
Phonetic Spelling: (goom-nad'-zo)
Short Definition: I train by physical exercise
Definition: I train by physical exercise; hence: train, in the widest sense.

1128 gymnázō (from 1131 /gymnós, "to train, naked or wearing a loin cloth") – properly, naked or lightly clad, as with an ancient Greek athlete in a sporting event; (figuratively) to train with one's full effort, i.e. with complete physical, emotional force like when working out intensely in a gymnasium.

["Gym" and "gymnasium" come from this same root.]

1128 /gymnázō ("exert intensely, like a pro-athlete") presumes full discipline, necessary to be in "top working condition" (full agility, skill, endurance). This is gained only from constant, rigorous training (exercise). 1128 (gymnázō) conveys acquiring proficiency through practice – regular exercise with graduated resistance (the physical element is also included with the spiritual of being in "God's gymnasium").

Word Origin
from gumnos
Definition
to exercise naked, to train
NASB Translation
discipline (1), trained (3).