Maintaining constant mindfulness of the breath is a very advanced meditation practice, but it can have profound benefits. Here are some tips for cultivating constant breath awareness:

1. Start with regular, daily practice: Begin by setting aside 10-20 minutes each day to sit and focus solely on the breath. This builds the habit and trains the mind.
2. Integrate it into daily life: Throughout your day, take moments to check in with your breath - while walking, waiting in line, before meals, etc. This helps extend the practice.
3. Use the breath as an "anchor": Whenever you notice your mind has wandered, gently bring your attention back to the sensations of breathing. This trains continuous awareness.
4. Be patient and persistent: Maintaining constant breath awareness is challenging. Your mind will inevitably wander. The key is to keep redirecting your focus back to the breath, again and again.
5. Don't force it: If you find it's causing tension or frustration, ease up. The goal is to cultivate a relaxed, present state, not strain.
6. Combine with other practices: Pairing breath awareness with body scans, loving-kindness, or other mindfulness techniques can reinforce the overall practice.

The benefits of constant breath mindfulness include deeper concentration, emotional regulation, and an overall sense of calm and clarity. But it takes dedicated, daily effort to develop this skill. Start small and be kind to yourself in the process.