Control the breath and you control the pace.
Nasal Only
Zone 2 sessions should be entirely nasal. Switch to mouth only when intensity demands it.
Box Breathing
Inhale 4 counts, hold 4, exhale 4, hold 4 — calms pre-race nerves effectively.
Cadence
Aim for 3 steps inhale, 2 steps exhale while running. Adjust to your natural rhythm.