Get ready and Limber up

Limber up and get ready are semantically related In some cases you can use "Limber up" instead a verb phrase "Get ready".

Limber up verb - Make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity.

Get ready and limber up are semantically related in loosen up topic. You can use "Get ready" instead a verb "Limber up", if it concerns topics such as warm up.