Instructions
Start a race with your favorite character.
Watch as the countdown numbers at the Start line begin to descend.
Press and hold the "2" button on your Wii remote when the countdown number "2" starts to fade from the screen. The countdown "2" should still be visible, but disappearing when you press the "2" button on your controller to successfully activate the Quick Start boost.
Recover from a fall during the race by pressing the "2" button on your controller the moment your character lands on the ground. This will provide your character with a temporary boost so he can get back in the race quickly.