G1128–γυμνάζω–gumnazō

But refuse profane and old wives' fables, and exercise thyself rather to godliness.

γύμναζε gumnaze “do train”

But strong food belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

γεγυμνασμένα gegumnasmena “trained”

Now no chastening for the present seemeth to be joyous, but grievous: nevertheless, afterward it yieldeth the peaceable fruit of righteousness to them who are exercised by it.

γεγυμνασμένοις gegumnasmenois “trained”

Having eyes full of adultery, and that cannot cease from sin; beguiling unstable souls: they have a heart exercised with covetous practices; cursed children:

γεγυμνασμένην gegumnasmenēn “exercised”