If this doesn’t work, open the Esc menu and go to Options → Controls to assign a key to sprint.

You can turn left and right as usual while sprinting, though this slows you down slightly. [2] X Research source While sprinting, you can jump four blocks horizontally instead of two. Your jump height does not increase. [3] X Research source

Sprinting uses up your saturation and hunger 10 times faster than walking. Jumping while sprinting uses them up 80 times faster than walking. [4] X Research source

If you don’t use the sprint key, instead start sprinting on the ground, then double tap space to start flying.

While sprinting, you can jump three blocks forward instead of two.

If your version of Minecraft does not have hunger, you are playing an old version that does not have sprinting. [8] X Research source Connect your device to the internet and open Minecraft to download the latest update.