I’m a 14 year old boy and I wanted to know what type of exercises I can do to do to expand my vocal range so I can hit a whistle register. I really don’t know how many octaves I have but I think it is 3.
The male voice does not have a whistle register; it has what we call a falsetto (thinner higher notes that you make using the false vocal cords). Because the voice is so vulnerable at your age, you are best advised to work with a teacher or to simply do what is natural and easy for you. You should not do anything that tires you vocally and it is not the time to be developing an extensive range. You would be better off developing a strong breath support, precise phonation and resonance. Refining these functions naturally leads to a more expansive range.