"Sprinting, Jumping and Striking", "Sprinting is very simple; while walking, double-tap and hold either 'W' or 'Shift'. 

Don't use this too much, however, because sprinting drains your hunger bar. In order to jump, simply press the Spacebar. 

Finally, striking mobs.

Striking uses the same button as breaking blocks. 

Simply Left-Click to punch once. 

If you equip a sword, damage will increase. 

You can also jump and strike which will cause a Critical Hit for more damage."
