Or during the cold half of the year because it is a required procedure:
Do the normal Takeoff Procedure with the following modification:
When engine anti-ice is required and the OAT is 3°C or below, the takeoff must be preceded by a static engine run-up.
Use the following procedure:
Advance thrust to 40% N1 and let the engines momentarily stabilize. Then run-up to a minimum of 70% N1 and confirm stable engine operation before the start of the takeoff roll. A 30-second run-up is highly recommended whenever possible.