Master CO₂ Tolerance for More Powerful Altitude Performance

Climber on a snowy mountain, illustrating CO₂ tolerance and endurance at high altitude

CO₂: The ‘Waste’ Gas That’s Not Wasteful At All → It’s Actually Fuel for More Endurance By Anthony Lorubbio, founder and head coach at Recal Carbon dioxide is often misunderstood. When most people think of carbon dioxide (CO₂), they may picture […]

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The 5 Breathing Self-Assessments Every Athlete Should Know

Man sitting on top of the mountain watching the sunset

These self-assessments give you a clear snapshot, without the use of special equipment, of how well your respiratory system is working, what needs improvement, and where you can focus your breathwork training for better performance at altitude, in endurance sports, and in everyday life.

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4 Ways I Was Able to Feel Less Out-of-Breath While Climbing at High Altitude

Improve CO₂ tolerance for better breathing on high-altitude

In this article, I cover how I was able to train for that feeling of breathlessness and climb better at high altitude. I talk about assessments to analyze where you’re at with your own breathing, plus how to specifically train to improve.

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How I Use Breathing Zones to Know If My Breathing Mechanics Are Most Optimal

Man with one hand on his chest and one hand on his belly.

Breathing zones determine how efficiently we take in oxygen, especially for mountain endurance athletes. We breathe over 20,000 times a day, yet most of us never stop to ask: Am I actually doing it right?

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