system
Given the following post, respond as if you're commenting on Reddit:
human
[Videogames] When jumping/falling, how do videogame characters change the direction of their trajectory?
gpt
Atmosphere is not a vacuum. Propulsion and changes in direction come from providing a "push" against a medium.

With enough force against the air, you could jump on it, walk through it, swim through it etc.

They simply push hard enough to "double jump"