Use "limber up" in a sentence

1. The following simple exercise will help to limber up the spine and prepare it for more difficult postures

2. Simply for the very good reason that it is difficult for the beginner to master and I wanted you to limber up with some easier exercises before attempting to balance on your head

3. A team of mules in November 1916 was taking a double limber up to the line in pitch darkness on the Béthune-La Bassée road