if you are trying to extend your range:
-make a sound like a siren (up and down and repeat)
-sing as high as you can (but don't strain/ if it hurts, stop)
-buy one of my vocal training cds
(contact: famousfailure@yahoo.com)
-realize that maybe you don't need to have higher pitch
-make sure you are recognizing the difference between a chest voice and a head voice.
-relax (tension makes a strained sound)
if you are trying to protect your voice: drink warms drinks, don't smoke or drink, pratice often, don't sing from your throat, sing from you lower abs, breathe, breathe,...