Ferriss notes significant physiological changes while in ketosis, including needing 2-3 fewer hours of sleep and at least doubling his breath-hold time. He also experiences a dramatic reduction in ruminative thoughts, improving mental clarity and sleep onset.

Research found that diverse prayers, like Buddhist mantras and the Catholic Rosary, all guide practitioners into a breathing rate of ~5.5 breaths per minute. This "coherent breathing" state maximizes heart rate variability and blood pressure regulation, suggesting an ancient, embedded wisdom for physiological balance.

Focusing on building muscle is crucial for long-term health, particularly for women entering perimenopause. Muscle helps regulate blood sugar, reduces inflammation, and protects against osteoporosis, dementia, and heart disease, making it a vital health indicator.

Many people jump into complex breathwork classes while ignoring their foundational breathing, which is often dysfunctional (e.g., mouth breathing). Mastering normal, efficient nasal breathing provides more significant and sustainable health benefits than occasional, intense breathwork sessions.

A 7-year study of healthy individuals over 85 found minimal genetic differences from their less healthy counterparts. The key to their extreme healthspan appears to be a robust immune system, which is significantly shaped by lifestyle choices, challenging the common narrative about being born with "good genes."

To shift from anxiety to a peak performance state, use physical mechanisms. A specific technique involves scaled, intense breathing to oxygenate the brain and lower cortisol, followed by Qigong "cupping" to open the body's meridians. This provides a physiological lever for emotional regulation.

The common aversion to living to 120 stems from assuming extra years will be spent in poor health. The goal of longevity science is to extend *healthspan*—the period of healthy, mobile life—which reframes the debate from merely adding years to adding high-quality life.

Contrary to popular belief, many elite athletes have suboptimal breathing mechanics, relying on shallow chest breathing instead of their diaphragm. This wastes energy and raises their heart rate. Retraining their breath is a key, often overlooked, way to unlock significant performance gains.

To reduce stress in real-time, the most effective breathing technique is a double inhale through the nose followed by a long exhale. This method reinflates collapsed air sacs in the lungs, maximizing carbon dioxide offloading and rapidly activating the body's calming systems, often within seconds.