from training.npr.org: https://training.npr.org/2021/12/06/healthy-voice-cold-flu-allergies/
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Don’t let colds or allergies make you sound as bad as you feel
NPR announcer Jessica Hansen shares her tips for sounding healthy despite colds, flu, allergies and other voice-affecting afflictions.

Trill, buzz, floss, breathe: Coach yourself to sound your best
Do your guests sound nervous, flat, sing-song or just plain blah? These guides will cure their vocal woes.

Aerobics for your voice: 3 tips for sounding better on air
To build a strong vocal presence for audio storytelling, you should practice a daily warm-up routine that involves body, breath and voice.