Infinite Sprinting (Whistle Sprinting)
Sprinting while holding B will drain stamina, but pressing down on the D-Pad will make you whistle which is not a stamina consuming action. By tapping B over and over while holding down on the D-Pad, you will regain any missing stamina and keep up a running speed. Since you are refilling stamina, this allows for infinite sprinting. This does not apply to any other stamina consuming action.