Hilo Core brings Aktiia’s optical blood-pressure technology to the United States in a $239.98 first-year system. The wristband is a wellness trend tool, while exact reference readings come from the…
A landmark UK Biobank study of 13 million hours of wrist-sensor data found that bright days and dark nights predict longer life. Here is the science of circadian light, and…
A 122,000-person Cleveland Clinic study found that low cardiorespiratory fitness carries a greater mortality risk than smoking, diabetes, or coronary artery disease, with no upper limit of benefit. Inside the…
A 2018 JAMA Network Open study of 122,007 patients found that low cardiorespiratory fitness was a stronger predictor of mortality than smoking, diabetes, or coronary artery disease. Inside the Mandsager,…
The most powerful longevity intervention in exercise science is not the hardest workout. It is the easiest. Inside the science of Zone 2 training, the lactate shuttle, Iñigo San Millán’s…
Heart rate variability is the most misunderstood number on your wearable. Inside the science of HRV, the vagus nerve, what the Framingham and UK Biobank studies actually predict, and a…
A 122,007-patient Cleveland Clinic study found that low cardiorespiratory fitness carried a hazard ratio for all-cause mortality of 5.04, higher than smoking, diabetes, hypertension, and end-stage kidney disease combined. Inside…
In 2026, cardiorespiratory fitness is the most validated longevity marker in medicine. From Cleveland Clinic mortality data to Ulrik Wisløff’s 4 by 4 intervals and Iñigo San Millán’s zone 2…
A new wave of 2026 research from Stanford, Harvard, and the Karolinska Institutet is rewriting what the vagus nerve does and how simple breathing practices can tune it. Here is…
Breathing at six breaths per minute activates the vagus nerve, raises heart rate variability, and shifts the autonomic nervous system toward recovery. A growing body of peer-reviewed research shows that…
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