I don't have any problem with my voice Dick- I don't use it as much as I used to, but if your exercises help you, good for you- I'm likewise happy that it has helped Jim C as well.

   However I have a friend from Fermanagh with a very distinctive voice - it's tuneful & enjoyable, but vaguely classical, and certainly not of that county. She once told me she'd had singing lessons when young, and much as she'd LOVE to sing in the lyrical Ulster style, she found it simply impossible to shake off the training from her youth.
Us old codgers are probably safe enough but maybe younger singers should beware of altering their voice in any way, and to beware of later consequences?