Sprinting

Sprinting is an upcoming feature in Beta 1.8, which allows the player to run two times faster than walking. The player sprints by double tapping (default) and then holding it. It will be possible to jump across four blocks horizontally (instead of the usual one block) by sprinting, however the jump will be no higher than normal.

Sprinting will be unlimited, but will decrease your hunger bar slowly. When a player sprints, particles will come from the player's feet. When a player hits any passive animal (excluding squid), the animal will start sprinting away from the player.

If you hit a mob while sprinting, the mob will fly back.

Sprinting stops when you run into a block or parry with a sword. You do not stop sprinting when you run into a mob.