Sing Fit

Healthy sound is freely produced and well supported. Fundamental skills are

1. achieving and maintaining a sound free from strain - "freely produced"
2. controlling the breath - singing with "support"

Anything else you want to develop - eg range, tuning, expression, power etc - comes in addition to these two skills. Work in these regularly, and use them as a basis for developing other aspects of your sound.

Choose your workout based on what skill you'd like to develop today. A good mix of all is best and regular work on reducing strain and developing support is a foundation for everything else.