Breathe through both your nose and mouth
Keep your breathing relaxed and steady
Match your breathing to your pace
Use deeper belly breaths instead of shallow chest breaths
Exhale fully to make room for the next breath
Try a rhythmic pattern like 2 steps in, 2 steps out
Slow your pace if you cannot keep control of your breathing
Focus on breathing out during effort
Stay upright with relaxed shoulders and open chest
Practice breathing during runs so it feels natural