Performance Stack

Performance Stack Evidence-based performance frameworks for ambitious professionals. Biology, psychology and strategy.

Quick test: are you a Suppressor, a Reactor, or a Channeller?Same stress response. Three completely different outcomes.S...
10/08/2026

Quick test: are you a Suppressor, a Reactor, or a Channeller?

Same stress response. Three completely different outcomes.

Swipe through the quiz and find out. Then try the one-line fix that actually works, backed by research on public speakers, singers, and people solving math under pressure.

Spoiler: it’s not “calm down.”

Full breakdown in this week’s newsletter. Link in bio.

The cold plunge dopamine stat everyone quotes?It comes from 6 men sitting in cold water for an hour in 1977.The studies ...
06/07/2026

The cold plunge dopamine stat everyone quotes?

It comes from 6 men sitting in cold water for an hour in 1977.

The studies measured chemicals in blood, not in the brain. Every study was done on men. The cardiovascular risk is real and almost never mentioned by anyone selling cold plunge tubs.

None of this means cold exposure does nothing. It means the claims are doing considerably more work than the evidence supports.

Full breakdown in this week’s newsletter. Link in bio.

An 80-year Harvard study tracked hundreds of people from 1938 onward. The single strongest predictor of long-term health...
29/06/2026

An 80-year Harvard study tracked hundreds of people from 1938 onward. The single strongest predictor of long-term health and happiness was not career success, IQ, or genetics.

It was relationship quality.

High performers track sleep, deep work, Zone 2 minutes. Almost nobody tracks this, because the feedback is too slow to compete with everything else.

Full breakdown in this week’s newsletter. Link in bio.

Before you go: message one person you have not talked to in months. That is the whole action.

Same meal. Same portions. Two different times.Your body does not process them the same way.Insulin sensitivity peaks in ...
23/06/2026

Same meal. Same portions. Two different times.

Your body does not process them the same way.

Insulin sensitivity peaks in the morning and declines through the day. A meal at 8am produces a smaller glucose spike than the same meal at 8pm. The food never changed. The biology did.

This is not about willpower or what you eat. It is about when.

Three rules that change the outcome without changing a single ingredient.

Full protocol in this week’s newsletter. Link in bio.

Save this. Try Rule 2 at your next lunch.

You are not sleeping badly because you sleep too few hours.You are sleeping badly because the hours you do sleep are not...
15/06/2026

You are not sleeping badly because you sleep too few hours.

You are sleeping badly because the hours you do sleep are not doing what they are supposed to.

Your brain cycles through two distinct stages overnight. The first half consolidates memory. The second half handles creative thinking, working memory, and cognitive repair. Cut your sleep short and you lose the second half first.

That is the expensive part.

Full sleep architecture protocol in this week’s newsletter. Link in bio.

Save this. Your next morning depends on what you do tonight.

The 21-day habit rule came from a plastic surgeon writing about phantom limbs.Not a study. Not a researcher. A casual ob...
01/06/2026

The 21-day habit rule came from a plastic surgeon writing about phantom limbs.

Not a study. Not a researcher. A casual observation about patients adjusting to a new face after surgery.

It sold 30 million copies and became the most repeated number in productivity culture.

The actual research: 66 days on average. Range of 18 to 254 days.

Most people quit habits at exactly the wrong moment because they expect automaticity by week 3. The difficulty is structural. Not personal.

Full breakdown in this week’s newsletter. Link in bio.

Save this. Send it to someone who gave up on a habit recently.

Most performance questions have a number for an answer.How many hours of deep work. How many minutes of Zone 2. What tim...
26/05/2026

Most performance questions have a number for an answer.

How many hours of deep work. How many minutes of Zone 2. What time did you actually get into bed.

This one does not.

Question 6 from this week’s quarterly review is the only one that requires you to stop, think, and sit with the answer for longer than 30 seconds.

It is also the one that determines whether the energy you are putting into all the other questions is pointed in the right direction.

Full review in this week’s Performance Stack newsletter. Link in bio.

Save this. Send it to someone who needs it.

Most people think meditation is about clearing your mind. It is not.Your brain has a default mode that generates mind-wa...
21/05/2026

Most people think meditation is about clearing your mind. It is not.

Your brain has a default mode that generates mind-wandering and rumination the moment you stop focusing. Overactivity here is linked to anxiety and depression.

Meditation trains you to notice when it switches on. That noticing rewires the brain. 8 weeks. Measurable change.

Link in bio.

One notification costs you 23 minutes of peak thinking. Not because you acted on it. Because your brain registered it as...
04/05/2026

One notification costs you 23 minutes of peak thinking. Not because you acted on it. Because your brain registered it as a pending demand and allocated attention to it.

Gloria Mark at UC Irvine has been studying this for two decades. The number has not improved. If anything, the smartphone has made it worse.

The fix is not more discipline. It is environment design. Swipe to see the 5 interventions.

Full protocol in this week’s Performance Stack newsletter. Link in bio.

The most driven people I know are also the worst at switching off.Not because they are undisciplined. Because somewhere ...
02/05/2026

The most driven people I know are also the worst at switching off.

Not because they are undisciplined. Because somewhere along the way, productivity became identity. And when your worth is tied to output, rest does not feel like recovery. It feels like losing ground.

The restlessness on a Sunday afternoon is not laziness. Research on motivation and reward suggests that busyness produces dopamine. Remove it and the discomfort is real, not imagined.

The body knows when it needs to stop. The high achiever’s identity overrules it every time.

Until it cannot.

Recovery is not the opposite of performance. It is the mechanism that makes performance sustainable. Rest is not something you earn by exhausting yourself first. It is a biological requirement that does not negotiate.

Save this if you recognise yourself in it.

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