[ali*]

check ur posture, make sure you're not squashing ur lungs and diaphragm, try breathing through ur diaphragm (ur mouth, like ur going to yawn, instead of through ur nose), some people say lifting ur chin higher prevents flatness, but it also strains the vocal chords, so u prob dont want to do that. also- visualise!! most singing techniques are in ur head [img]smileys/smiley4.gif[/img]hope this helps a little, then again u could always just clench ur butt cheeks,lol