19/04/2026
This morning was simple work. Very intentional work.
Resistance mask. Zone 2 & 3. Respiratory training.
This isn’t a gimmick — when you understand the physiology, it becomes one of the most intentional tools in your kit.
Here’s what’s actually happening:
🫁 Stronger respiratory muscles
The resistance trains your diaphragm and intercostals — better mechanics, better CO2 tolerance, better breathing under pressure.
🏔️ Simulated altitude stimulus
Restricted airflow mimics reduced oxygen availability, stimulating red blood cell production and improving oxygen delivery over time.
🧠 Improved CO2 tolerance
Regular exposure to that “air hunger” trains your nervous system to stay calm and functional longer before fatigue hits. That transfers far beyond the gym.
❤️ Deeper cardiovascular adaptation
Zone 2 & 3 is where the real aerobic foundation is built — mitochondrial health, metabolic efficiency, nervous system regulation. The mask amplifies that stimulus without extra load on the legs.
💪 Mental resilience
Learning to stay calm when breathing is restricted is training in itself. That stillness under pressure carries into everything.
A big part of my understanding here comes from the Oxygen Advantage Instructors course with and the Performance Breathing course from — genuinely game-changing.
⚠️ Note: The mask doesn’t perfectly replicate altitude — the hypoxic effect is real but modest. Keep intensity managed. If dizziness shows up, ease off immediately. Always listen to your body.
Sometimes the smallest shifts in how you breathe create the biggest changes in how you perform, recover, and live.
Curious about breathwork or building resilience from the inside out? I offer 1:1 coaching, workshops and breathwork sessions. Link in bio.
altitudetraining mindsettraining CO2tolerance aerobicfitness intentionaltraining