system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/DC] How does a speedster go downwards or down stairs at super-speed?

When a normal person goes down a flight of stairs they are allowing their body to fall to the next step at 9.8 metres per second per second. So a speedster shouldn't be able to go in a downwards direction faster than gravity. How do people like Quicksilver overcome this? NO SPEEDFORCE PLEASE!
gpt
Speedsters can run down stairs the same way they can run up or across walls- their capacity to propel themselves creates greater force than gravity, and they are able to move to their next step (and continue propelling themselves) before gravity takes effect between actions.

A speedster running down stairs wouldn't go down stairs the way we do, which is essentially a controlled fall. They'd position themselves in such a way that they are literally propelling themselves downwards, faster than gravity.