Instructions
Turn on the game and enter any game mode.
Walk toward the skateboard and press the "Y" button to step onto the skateboard.
Press the "A" button to push the skateboard. Continue skating, tapping the "A" button on occasion to build speed. Move forward with the right stick.
Place your finger on the left control stick. Keep moving forward with the right stick.
Pull the left control stick backward, toward your body, with one fast motion. Release the left control stick to complete the backflip.