How to Whistle with 4 fingers

In this video the instructor shows how to whistle using four fingers. The first thing he shows is how to make a V formation using the index finger and middle finger of both your hands. Now he shows how to place them on your tongue by folding the tongue back words. He shows how to seal around all the cracks in the mouth and says that the air should be let out only through the center opening. He finally blows a whistle using the method shown. This video demonstrates how to whistle using four fingers in a simple way.