A forced voice sounds strained, hoarse and deliberately loud. For people with big voices this comes naturally so the voice does not lose the beauty of its vibrato. M.Garsia, the famous vocal coach, wrote: "Once the voice tenderness lost, it will never return". Forcing leads to detonation, distorts the timbre. The flying sound cannot be achieved if singing like this as well as the ability to "go throughout" the hall, although for the singer the voice seems to be unusually strong and some inexperienced singers think, it should be clearly heard above the orchestra and the audience. In case of such error, it can be recommended to switch to a more lyrical repertoire that would not provoke singing with "big" voice on the emotional lift.
Very often is the case when the singer is in acoustically uncomfortable conditions: in an anechoic room, with lots of upholstered furniture that absorbs the sound. The singer starts to force the sound. As a result, the vocal cords overstrain, and the voice can no more obey the vocalist. At best, you will have to be silent for a few days. If you use the upper resonators, the voice will be not only louder, but also the senses of its functioning will create additional sources of control. Forcing the sound occurs most often when you are trying to transfer the power from resonance to breath.
The second type of forcing occurs when a person who has recently taken up singing, takes impossible tasks. For example, trying to sing a high note or singing too long.
As an advice: until your vocal tract gets stronger, do not force hand, sing in your midrange not longer than 30-40 minutes a day, better do pauses. If after your studies voice is weak and you find it hard to speak, reduce your lessons to 10 minutes. If that does not work, continue to reduce your lessons to find the optimal time.
At the beginning of training the importance of singing exercises is not questioned as a rule. Indeed, doing the exercises, you can safely learn the basic techniques of singing. They are usually selected in the way that they develop singing skills without being difficult to perform. Exercises gradually take us from simple to complex things. Having achieved the first success, the beginners often stop paying enough attention to the exercises and, as a result, are pushed back for a while. The vocal tract not used to such position loses singing skills if the singer stops to pay attention on its functioning. The proper coordination would return to him if he were able to stick to a "vocal diet", in other words, not to sing anything other than exercises and then slowly add practiced old repertoire before starting again his way to vocal perfection.