The goal is to push the limits of the game's physics not real life. Quake based games allow you to retain speed when jumping at the same 'frame' as landing (bunny hopping) and slide up slopes with enough speed.
These physics create a high skill ceiling for speed runs and in normal play because of how powerful movement becomes during play.
These physics create a high skill ceiling for speed runs and in normal play because of how powerful movement becomes during play.