Performance Stack

Weekly frameworks to optimize your biology, psychology, and strategy for peak performance.

Latest

The Ultradian Rhythm and Your Real Focus Window

Sep 7, 2026

Your brain does not run flat all day. It cycles. Most productivity advice ignores this completely.

Cortisol Is Not Your Enemy. Chronic Cortisol Is. Here Is the Difference.

Aug 10, 2026

The same physiological stress response can sharpen you or break you. The research showsthe difference is not the stressor. It is how you interpret it.

You Will Forget 70% of What You Read Today by Tomorrow. Here Is How to Stop That.

Jul 20, 2026

The forgetting curve is one of the oldest and most replicated findings in cognitive psychology. Reading is not learning. What you do in the 24 hours after reading determines whether the information stays.

You Have Optimised Almost Everything. But Are You Even Building the Right Thing?

Jul 13, 2026

Meaning and purpose is the final pillar. It is also the one that determines whether all the other optimisation is pointed in the right direction.

The Cold Exposure Stat Everyone Quotes Comes From Six Men in a Bathtub in 1977. Here Is the Full Story.

Jul 6, 2026

A wellness industry built on two small studies, a measurement nobody checked, and a sample that excluded half the population. Performance Stack went looking for the actual evidence.