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.
(..) He's got a little boy. He'd love to have a pet mouse, I bet. How could a boy be trusted with Mr. Jingle? Maybe forget to feed him. How he keep up with his training? I mean, he just a boy, rest-ce pas? Mmm. All right. I'll take him, then. Me. Thank you kindly, but... (..)1999 The Green Mile