wikihow zegt:
# Practice whistling using just your lips. If you can do this well already, you are almost there!
# Put your thumb and middle or pointer finger up to your lips, it may help if your nails are against your teeth and pointed inwards . Form a small gap between the tips. The gap should be about 1/8 inch at most.
# Stick the two fingers slightly into your mouth and close your lips around just enough to allow air to flow through the gap between your fingers. Your lips should be stretched tightly, not loose.
# Press your tongue to the back of your lower jaw, just behind your bottom row of teeth. You should feel a small ledge or bump there.
# Blow air using the top of your tongue to guide the air through the small gap in your fingers. Blow lightly at first, finely adjusting your finger, lip, and tongue placement until you hear a faint whistle. Then begin to blow more air to make for a louder whistle.
en verrek, ik fluit
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heel zachtjes, maar ik blijf oefenen