Vocal Exercises

Vocal exercises are a must if one wants to improve him vocal chords or wants to improve his range. Also if one wants to maintain his/her range vocal exercises are a must.
Warm ups are also a part of vocal exercises and care must to taken to ensure no harm is done while engaging in such exercises.
But beware as wrong exercises can actually damage your vocal chords.
So always start in the middle range (ie the most comfortable note for you) and then try to hit the higher and the lower notes, take a break for 2-3 after sometime drink water if you feel that your throat hurts, then start again..
There are a number of ways For warm up one of them is
Exercise 1
Start By first opening the mouth wide open and then take a deep breath from your mouth. Then let out a siren type of sound ("wooo" or "weee") and feel it go up into the head cavities. Now let out a "wooo". Pay attention to the feeling of resonance in your head(head voice).
Exercise 2
Say the word "dumb", And continue to have the feeling of yawning. Sing a scale (dumb..dumb..dumb..dumb..etc.). As you ascend, let your voice cross over into the same resonance area you felt in the previous exercise. You should begin to feel the shift from chest voice into head, and back again. Don't worry if your voice breaks or cracks at first. With practice, this will smooth out and disappear. You will always feel the shift in resonance, but ultimately the listener will never hear it.

Exercise 3
Now say the word "mum" in your normal speaking voice. As you sing a scale on this word, don't let it get louder or strained as you go higher. Keep it very light if you must. Once again, allow it to cross over into your head resonance area. It will feel weak at first, especially if you are used to pulling your chest voice too high into your range.
Never go higher than is comfortable and always stop at the first sign of strain.
Here is a site that contains a range of warm ups the will be useful for warm ups. Listen to the midid file and then sing along with it :