Breathwork and the Physiological Sigh: What the Evidence Shows
The physiological sigh is two inhales and a long exhale. What the trials show, how to practise it, and why intense breath-holding is risky.
HRV and Stress: What Heart Rate Variability Can and Can’t Tell You
HRV responds to stress, alcohol, breathing and exercise. Here is what the research shows it can tell you, and why it is not a score for how well you will think.
The Complete Guide to Biohacking: Evidence-Based Advanced Protocols for Cognitive Performance
“Biohacking” gets treated as one philosophy, but sauna, cold exposure, HRV tracking, and fasting each have wildly different evidence behind them. Here’s what each one actually shows — including an honest null result for HRV and cognition that rarely gets mentioned.
Cold Exposure and Cognitive Performance: An Honest Look
Cold water raises noradrenaline and often lifts mood, but thinking gets worse while you’re cold. What the studies show, the real numbers, and the safety risks.
