Removes air resistence from the game, that means;
- bunny hoping is way faster
- spear lunges makes you go way farther mid air
- better control of where you fall
- mobs that can send you in the air are way more dangerous
This is disabled by default in creative/spectator so you can stay in control while flying
Instalation
For the datapack version, go to the datapacks tab when creating a world, click the button to open the datapacks folder and drag the datapack inside, it should appear in the left side of the screen, after that enable it like you would do with an experimental datapack.
For the mod version (on windows), right click the start button and and go to execute, then enter %appdata% on it, this will open a folder, go to the .minecraft and then mods, drag the .jar there.
