up and (do something)

To do something quickly, unexpectedly, or abruptly, especially without warning or explanation. I must have offended him, because halfway through the conversation he just up and left. The town has been in a panic searching for a young girl who up and vanished over the weekend. Everyone asks how I came up with the story, thinking it must have taken all this time and planning, but the truth is one day I thought up the premise and then I just up and wrote it.

up and doing

Active, especially following a time of illness, injury, or idleness. After having the flu, I'm so excited to be up and doing again. A: "Doc, how long will it take until I'll be up and doing again?" B: "Well, you'll be in cast for at least six weeks."