Here’s my recipe for how to practice:

1.  Something for your spine  – roll down your back into a hang, do neck rolls, etc.
2. Get your breath moving – staccati, lip trills, hissing
3. Move through your whole range – big whoops, octaves, arpeggii
4. Fine tune a bit – vowels, slow scales
5. Work on a piece – pick something you’d like to tackle for 5 minutes.  See below for details
6. Sing for fun

Practice logs – when you practice, have a goal in mind and a stopping point.

Example:

“Bist du bei mir” – the high part of the second section, make smoother and easier

time allowed: 5 minutes

Tools: lip trills, staccati

When the timer goes off, write down what worked and what didn’t, and what you’d like to do next with it, if anything.  It’s a great way of seeing what tools work best for you and thinking of new ones.