A friend of mine had a voice teacher who suggested humming high notes to teach the vocal folds how the high notes feel. Makes sense to me.

And of course, one could track down the exercises which the Voxguru refers to. RTFM, if you will.

I'm not singing as much as I used to. No choir, no church services. I know I should sing more. A 'crash course' just before the Singaround is not enough. But I'm hoping when a good frost comes and knocks out the pollen, my voice will be better.