The goal is control, not volume
Starting with high notes or loud volume can invite throat tension. Begin lightly, then expand range and loudness gradually.
Warm-ups need feedback too
A warm-up based only on feeling makes it hard to tell whether your voice is stable today. Pitch, sustain, and brightness feedback show when it is safe to add difficulty.
Do not push through fatigue or pain
If the voice is hoarse, painful, or clearly fatigued, a warm-up is not a substitute for rest. Stop and seek qualified help when needed.