Relax your body and search out any areas of tension in your body. Extend you head high as if it was pulled upwards by a string. Relax the throat and place your shoulders slightly back and relaxed.
Breathe in using your diaphragm. Fill your lungs with air and take in air with your sides and stomach. You should feel your entire diaphragm expand.
Sing by controlling the airflow from your diaphragm; avoid the tendency to belt and use a controlled even stream of air when singing. This will help improve your vocal range, since proper breath support must be maintained to sing high and vibrate the vocal cords effectively.
Sing a pitch starting at a comfortable point in your range. For sopranos and altos start on middle C; tenors and baritones should start a fifth lower, and basses should start an octave below middle C.
Sing up a major fifth and then come back to the starting note. If you do not know how to play piano, middle C is the white key next to the set of two black keys nearest the center of the keyboard. Depress this key and match the pitch. Then count up to the right seven keys, including the black keys and match pitch with the key seven keys above C. Altos and baritones will start seven keys below middle C and basses will start on the C below middle C.
Fall back down to the original pitch. Take a breath and then move up one key to sing the same exercise again. Continue singing these exercises until you can no longer sing any higher without causing strain.