After a while, she 'got into the swing of' her job. [=she got used to her job and was able to do it well]
They have to be ready to 'swing into action' [=to start doing something quickly] at a moment's notice.
She needs to work on her (golf) 'swing'. [=she needs to practice the way she swings a golf club]
(..) - Your wife said you were taking a cab home. - My wife?! Just you, sir? Don't worry, Master Wayne. Takes a little time to get back in the swing of things. Bruce Wayne... as I live and breathe. What brings you out of cryo-sleep, Mr. Wayne? I see you haven't lost your sense of humor. (..)2012 The Dark Knight Rises