How to sing from your diaphragm

"Diaphragm" gets overused. What singers really need is low, managed breath — ribs wide, belly engaged, throat passive.

Tips

Inhale so your lower ribs expand, not just your chest. Lie on your back with a book on your belly to feel it.
Exhale on a hiss ("sss") for as long as you can with steady pressure. That's the muscle singers use.
Sing phrases on one breath by planning where you'll breathe — mark breath marks in your sheet music.
Avoid the "belly punch" myth. You don't push your stomach out to sing; you manage the release slowly.
Practice breath before pitch. Five minutes of breathing drills saves twenty minutes of frustrated singing.

When to get a coach.

Breath support is the foundation every coach builds on. Get this wrong and everything else suffers.