Definitions for "Warm up"
Gentle, slow exercise at the beginning of a workout to prepare muscles, heart rate, blood pressure and body temperature for an activity.
To prepare for an athletic event (whether a game or a workout session) by exercising, stretching, or practicing for a short time beforehand.
cause to do preliminary exercises so as to stretch the muscles; "The coach warmed up the players before the game"
get warm or warmer; "The soup warmed slowly on the stove"
Low intensity swimming used by swimmers prior to a main practice set or race to get muscles loose and warm. Warm up gradually increases heart rate, respiration and helps to prevent injury.
Keywords:  lunch, friendly, together, open
become more friendly or open; "She warmed up after we had lunch together"
To allow an engine to reach its normal operating temperature.
run until the normal working temperature is reached; "We warmed up the car for a few minutes"