[n] exercising in preparation for strenuous activity
[v] prepare for strenuous physical activity
[v] do preliminary exercises so as to stretch the muscles; "The coach warmed up the players before the game"
[v] become more friendly or open; "She warmed up after we had lunch together"
[v] get warm or warmer; "The soup warmed slowly on the stove"
[v] run until the normal working temperature is reached; "We warmed up the car for a few minutes"