She's 'in training' to be an astronaut. [=she is being trained to be an astronaut]
a 'training manual' [=a book of instructions for a job or task]
She owes her flexibility to her early 'training' as a dancer.
(..) No more patrols. No more hide and seek. Get every available cop down there and smoke 'im out! - The mayor won't want panic. - So, it's a training exercise? I'm sorry I didn't take you seriously. Not you. You're telling me the Batman's gone... so you chase up the Daggett leads... (..)2012 The Dark Knight Rises
(..) with a load of fancy new toys from Fox. What about when you come up against him? What then? - I'll fight harder. I always have. - Take a look. His speed... his ferocity, his training.... I see the power of belief. I see... the League of Shadows resurgent. - You said he was excommunicated. (..)2012 The Dark Knight Rises