People say when u sing u have to use your diaphragm, what is a diaphragm?

Question

What is a diaphragm and how do i use it?

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Answer 1

take off your email -  just check your answers!

Answer 2

A diaphram is a thin muscle that moves up and down in your trunk, it is under the lungs and when it moves down gives you more space to expand the lungs.

Answer 3

it your voice box  :]