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Paul Tudor Jones is perhaps the best-known trader still active in the world. In 1987 he anticipated Black Monday and made $100 million in a single day — the documentary about it (Trader) was later pulled from circulation by him personally, because it glorified him too much. He runs Tudor Investment Corporation, a hedge fund with billions in assets. His annual return over 40 years: more than 25 percent.

But what makes him interesting is not the numbers. It is his routine. Jones gets up every morning at 4:30 a.m. A personal trainer comes to the house. One hour of strength training and cardio. Before he glances at a single chart. Then ten minutes of meditation. Then breakfast with his family, deliberately and without a screen. Only then does he open the Bloomberg terminal.

“Being mentally and physically tired is the worst condition in which to make risk decisions,” he said in an interview. “When I make a bad trade, I can usually tell you which routine I skipped that morning.”

Jones is not alone. Ray Dalio has meditated twice a day since 1969. Stanley Druckenmiller works out every morning before the market opens. Warren Buffett reads five to six hours a day — every year, without exception. That is no coincidence.

Richard Dennis — the man who trained the Turtle Traders — had a motto that he repeated to his students over and over: “A system that you follow 99 percent of the time is no longer a system. Either you follow it 100 percent or 0 percent.”

That sounds exaggerated. It isn't. Dennis had observed that most traders followed their rules almost always. Except for the one or two trades per month where they dared to do something different “just this once”. And exactly those one or two deviations ate up — statistically — the bulk of the annual return. Because they happened exactly where emotions ran highest. And because emotions in trading are mostly wrong.

The most successful Turtles — Jerry Parker, Curtis Faith, Paul Rabar — are billion-dollar managers today. But they all say the same thing when asked what the most important tip would be: breaking the rule you gave yourself is the most expensive moment of your trading life. Not because a single broken trade would ruin you — but because it proves to you that you don't trust yourself. And without confidence in your own rules, at some point you won't dare to do anything at all.

Annie Duke was one of the most successful poker players in the world before she hung up her career — and became a decision coach. Her clients: hedge fund managers, Wall Street traders, CEOs of global corporations. Her book Thinking in Bets has become required reading in trading firms. Her core idea is simple and radical at the same time: Distinguish between a good decision and a good outcome.

She calls it the resulting error: people judge the quality of a decision in hindsight by its outcome. If a trade won, it was “good”. If it lost, it was “bad”. That is fundamentally wrong, says Duke. In the real world every decision is a bet against an uncertain universe. A bet with a 90 percent chance of winning can lose the one time in ten that it loses. That does not make it a bad bet.

Duke learned this idea at the poker table. The best players, she said, never ask after a lost hand “What went wrong?” — but “Did I play the hand the way I had to play it with the information I had at the time?” If yes: next hand. If no: what do I change for next time?

In trading, that is the difference between an amateur and a professional. The amateur sees a losing trade and doubts their entire strategy. The professional sees a losing trade and checks whether they followed the process. If the process was clean, it was a good trade — even if the account shows less.