in action

US /ɪn ˈækʃən/
UK /ɪn ˈækʃən/
"in action" picture
1.

in Aktion, in Betrieb

doing something or operating, rather than being still or inactive

:
It's great to see the new machine in action.
Es ist großartig, die neue Maschine in Aktion zu sehen.
The coach likes to see his players in action during practice.
Der Trainer sieht seine Spieler gerne in Aktion während des Trainings.