Although every possible precaution has been taken in developing this method, no method of extreme singing can ever be completely safe.

Pay attention to what your voice is telling you. If you're straining, feel pain, develop hoarseness, or anything doesn't feel loose and easy, stop what you're doing.

These are indications that you are doing something incorrectly, and I recommend you book a private lesson with me at marsvocal.com so I can help you see what you're doing wrong.