1) Accustomed 2) Broken in 3) Coached 4) Disciplined 5) Drilled 6) Educated 7) Focused on, when one taught 8) Got in shape 9) Got into condition 10) Got ready for a big game 11) Got ready for action 12) Habituated 13) Hardened 14) House-trained 15) Housebroken 16) Instructed 17) Inured 18) Learned the ropes Found on https://www.crosswordclues.com/clue/trained
adjective having acquired necessary skills by e.g. undergoing a course of study; `a trained nurse`; `a trained voice`; `trained manpower`; `psychologically trained workers` Found on https://www.encyclo.co.uk/local/20974