Simple Sprint (stamina) Bar

Rather than your hunger draining normally, it drains much faster, but only whilst you sprint. It will refill when you are not sprinting, to mimic stamina bars commonly seen in other video games.

There will also be a stick figure indicator in the top left corner of your screen, which changes between four forms depending on what you're doing.

When your stamina is full but you are not sprinting, it will stand still. 

When your stamina is still regenerating but you are not sprinting, it will stand, sweating.

When you are sprinting, it will change to a running pose.

If you have the Saturation effect (obtained by drinking Adrenaline) and sprint, it will sprint too, but will not sweat, unlike the version seen when normally running.

There is also an Adrenaline potion, made by brewing a Golden Apple onto Awkward Potions. It gives you infinite sprint for 60 seconds and cannot be extended, strengthened, or made to a splash potion via further brewing.