Most flute teachers tell their students to 'support from the diaphragm' without really telling them what the physical sensation is going to feel like. A commonly held misconception is that support is an abdominal contraction. This is the exact opposite of what needs to happen. Try contracting (squeezing in) while talking...EVERYTHING feels wrong! (as it should). Support has nothing to do with a static contraction..it's an active pressure that sets the air column in motion: almost like a feeling of pushing gently out or down as the player exhales. It takes a lot of physical energy to create a great sound on the flute: using the 'whole body' to create the tone is mandatory!