Where are engine run-ups typically performed?

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Run-ups are a ground procedure performed after taxiing to a suitable parking area, typically on the ramp or apron. The ramp provides open space, adequate ventilation for exhaust, and a safe distance from terminals and other aircraft, so you can observe engine performance and monitor instruments without hazards. Performing this in a terminal area or a hangar would expose people to high noise, heat, and exhaust, and space is too confined; doing it in flight isn’t practical because run-ups test engine operation on the ground. This is why the ramp is the usual location for engine run-ups.