Breathe into it is the cue to exhale slowly while pressure is held, so the muscle can let go instead of guarding.
In 📝Trigger Point Therapy the hold only works if the person stays with it. A held breath is a brace; a long exhale is often the difference between a point that quiets and a point that fights. The cue is practical, not a spiritual claim and not a breathing protocol for a medical condition.
Clients feel the ache change on the out-breath, or notice they had been gripping. If the breath cannot stay easy, the pressure is too high. Dizziness or panic on the breath is a stop.