limber up

The swimmer limbered up for a few minutes before the final.

You need to limber up your wits before the exam.

As politicians limber up for European elections in the summer of 2019, the biggest party grouping in the European parliament, the European People’s party, is desperately clinging on to Orbán’s Fidesz party, and has even been making furtive overtures to Poland’s PiS, for fear of the Orbvini camp forming a new alliance to compete with it.