'Trained' in the Bible

Courageous men from the Gadites came over to David in the stronghold in the wilderness, men trained for war, who could handle shield and spear, whose faces were like the faces of lions, and who were swift as gazelles on the mountains.

So their number [who led the remainder of the 4,000], with their relatives who were trained in singing to the Lord, all who were skillful, was 288.