I think most singers have their own ways of warming up. Mine are bobbled together from various exercises I've found and use which parts suit me best. Many singers are hard to hear in Folk clubs especially without P.A and when I came back to singing after 25 years away from it I was barely audible. So I devised me own vocal evercises, the basic scales plus breathing and throat exercises to develp the volume. Within 2 weeks I was showing good signs of improvement,now 3 years on I can be heard very well at the back of the room without a P.A

I can highly reccomend a workshop I attended recently by Bella Hardry, she uses a mix of physical and vocal exercises, and I was pleased to see some were similar to the ones I'd developed on my own. Basically if you evercise the voice regularly you'll be a much better singer
Desi C
The Circle Folk Club
Every Wed Night Open Mic
Coseley West Mids UK
WV14 9JH