warm up

vb
to make or become warm or warmer
to exercise in preparation for and immediately before a game, contest, or more vigorous exercise
to get ready for something important; prepare
to run or operate (an engine, etc) until the normal working temperature or condition is attained, or (of an engine, etc) to undergo this process
to make or become more animated or enthusiastic
the party warmed up when Tom came
to reheat (already cooked food) or (of such food) to be reheated
to make (an audience) relaxed and receptive before a show, esp a television comedy show
n
the act or an instance of warming up
a preparatory exercise routine