боевкой

In a sentence

• Эта группа занимается боевкой в фильме.

  This group handles the action scenes in the movie.

  Here, 'боевкой' refers to the choreographed combat such as fight scenes in a movie.

• На тренировках мы отрабатываем боевкой сценки.

  During the training sessions, we practice fight scene routines.

  In this context, 'боевкой' implies practicing combat scenes or maneuvers.

• Его увлечение боевкой началось с юношеских лет.

  His interest in martial choreography began during his youth.

  Here, 'боевкой' implies the study or interest in action or martial choreography.