Head move

My friend wants to have a more manly voice.His voice is almost normal. I have given him some instructions to talk from the region of the uvula. 5 days he did the exercise. He was doing all sorts of small movements to improve the voice to be more manly. He moved the head  from right and left , up and down and waited for a few minutes and talked. He felt the sound was strong  and felt blowing in the ear and he felt, he got the manly voice. If anyone gives some explanation for this menovere and changes in frequency please contact me.