Does what it says on the tin. When you're gliding with elytra, you can press space to spend 1 hunger and flap upwards. If you're sprinting when you do this, it instead costs 2 hunger and rockets you in the direction you're looking. Good luck avoiding trees!
Made with MCreator and uploaded primarily for use of friends. I have no idea if this will work with modded elytra.
Logo obtained from FlatIcon; FreePik (https://www.flaticon.com/free-icon/wings_485625?term=wings&page=1&position=5&page=1&position=5&related_id=485625&origin=tag)

