'limber up' definitions:

Definition of 'limber up'

(from WordNet)
verb
Attach the limber; "limber a cannon" [syn: limber, limber up]
verb
Make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity [syn: limber up, warm up, loosen up]

Synonyms of 'limber up'

From: Moby Thesaurus