How to Warm up Your Voice

Warming up plays the most important role for any professional voice user and also for any human being interested in keeping his voice healthy for all the good reasons he can think of. You can think of warming up as a magical tuning of your voice box to encompass any kind of vocal production and vocal abuse. One of best programs available is the "Pro Singers Warm Up" program

Know that there are two registers in your voice. Lower register equivalent to the chest voice and the upper register equivalent to the falsetto and what people usually term as false voice.
Warm up to give more blood circulation around your voice box,give more flexibility and stamina to stay healthy for major part of the day.
Most effective way to warm up is to first strengthen your chest register which heals the vocal folds if used properly.
Strengthen your chest voice by doing the "kharaj riyaaz"(as called in India which means low note practice).
For 3-5 times, for a male take up mid c# as your scale. Take a deep breath and sing a long hmmmm in mid c#.
Move a half note lower. i.e. c. Now sing a long hmmmm in C. Do it 3-5 times and so on..slowly and steadily until you reach your lower possible note. which is for most low c#.
Go upwards from mid c# to mid A in a similar fashion.
Remember that volume of your voice should not be too loud or too low. It should be as comfortable as speaking volume.
Start to feel an ease in your voice.
Stop completely for 20-25 minutes; don't sing or speak.
After half an hour your voice will be fully open and you can sing anything in your vocal range.

Drink lots of water to hydrate your voice.
Take proper sleep.
Don't eat too many oily foods.
Exercise daily.
Having a healthy voice means being able to produce any kind of voice or sing any kind of song with effortless ease.
A warmed up voice recovers much faster from a vocal abuse than a non-warmed up voice.