A vocal warm up is essential in order to maintain a healthy voice and to make the most of the rehearsal session to follow. Warm-ups cover everything from stretching the body to preparing the muscles of the face, as well as introducing good vocal technique and focusing the mind.
Cooling down the voice at the end of your session is just as important as warming up in preparation for singing. By running through a few low-impact cool down exercises, the voice is prepared to return to its normal non-singing state. These exercises are therapeutic for tired vocal folds and have the effect of calming them.
·    Dietary Consideration
During singing, whether in performance or rehearsal, try to avoid eating food, especially sugary or creamy foods, or drinking alcohol and defiantly do not smoke!! Some foods play havoc with mucous levels, and it is very easy to increase mucous around the larynx and add to the overall fatiguing of the voice. Wait to have your meal after you’ve finished the performance. Also ensure that you always have plenty of water available to hydrate your vocals. Also if you have an oral piercing, it would be best to take it out before rehearsals and performing as it could mess up your articulation, and if you don’t have any oral piercing, it would be best to not get them.
While singing, vocalists should pay close attention to the position of their feet, knees, hips, abdomen, chest, shoulders, arms, hands, and head. Correct positioning of these makes it easier for sound to be produced.
·    The chin should be about parallel to the floor.
·    Shoulders should be held back and down, with chest held high, but not in a strained position.
·    Abdomen should be flat and firm, held in an expandable position.
·    Hands should be relaxed and still at the sides.
·    Knees should be flexibly loose, and never locked.
·    Feet should be slightly apart, one slightly in front of the other. The weight of the body is slightly forward.