Hold L and press A, B(2), A(2), Up, Down during game play.
Flip off bike
When you start on the second course, grind on all the rails in front of you. When you get to the water fountain jump, take a left. Go up the quarterpipe. Gain as much speed as possible. Do a 50-50 Grind on the rail that is all the way to the left. Go off the quarter-pipe. Gain as much speed as possible. Do a 50-50 Grind on the same rail except jump off at the bend. Go straight and crash into the wall. You will flip off your bike. Note: Do a freeride first to practice.