In a study on baseball players, the coach's emotional state...
Steve Magness@stevemagness
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Nov 24, 2025
~2 min read
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In a study on baseball players, the coach's emotional state directly predicted the players' performance.
An angry coach didn't make the team "tough." It made them frustrated, error-prone, and more likely to tank.
Emotions are contagious; as a leader, you are the super-spreader.
An angry coach didn't make the team "tough." It made them frustrated, error-prone, and more likely to tank.
Emotions are contagious; as a leader, you are the super-spreader.
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As a coach, boss, or parent, your mood is not a private matter.
You are constantly broadcasting a signal that your team translates into biological action.
If you are frantic, they are frantic. If you are confident, they are ready.
Be the thermostat, not the thermometer.
You are constantly broadcasting a signal that your team translates into biological action.
If you are frantic, they are frantic. If you are confident, they are ready.
Be the thermostat, not the thermometer.
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We think the "angry coach" gets results by scaring people into compliance.
Biology disagrees. Constant negativity spikes cortisol, which fuels anxiety and rumination.
You aren't making them tougher. You are chemically engineering them to play scared.
Biology disagrees. Constant negativity spikes cortisol, which fuels anxiety and rumination.
You aren't making them tougher. You are chemically engineering them to play scared.
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What athletes see and hear shifts their hormonal profile.
In elite hockey players, watching a video of a victory spiked testosterone—linked to motivation and risk-taking—by 44%. Watching a defeat did nothing.
You have to prime the brain with evidence of success to get the biological boost.
In elite hockey players, watching a video of a victory spiked testosterone—linked to motivation and risk-taking—by 44%. Watching a defeat did nothing.
You have to prime the brain with evidence of success to get the biological boost.
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The feedback you give right before the arena acts as a biological switch.
When rugby coaches highlighted successes pre-game, testosterone rose 15%.
But when they focused on "cautionary" mistakes, cortisol (stress) spiked by 20%.
Performance followed the hormones: the positive group played better; the negative group struggled.
When rugby coaches highlighted successes pre-game, testosterone rose 15%.
But when they focused on "cautionary" mistakes, cortisol (stress) spiked by 20%.
Performance followed the hormones: the positive group played better; the negative group struggled.
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Here is the wild part: this effect lingers for days.
Researchers found that a post-game debrief focusing on what went well kept testosterone higher a full week later.
Coaches judged those players' next game as significantly better.
The story you tell today sets the biological table for next week's performance.
Researchers found that a post-game debrief focusing on what went well kept testosterone higher a full week later.
Coaches judged those players' next game as significantly better.
The story you tell today sets the biological table for next week's performance.
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Stop treating pre-game speeches or feedback sessions as throwaway moments to vent your frustrations.
They are biological interventions that shift the hormonal landscape of your team. Be intentional.
Favorable outcomes happen when the signal you send shifts the balance from threat to challenge.
They are biological interventions that shift the hormonal landscape of your team. Be intentional.
Favorable outcomes happen when the signal you send shifts the balance from threat to challenge.
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Ultimately, you cannot fake this signal.
Your internal state is constantly leaking out and regulating the nervous systems of those you lead.
If you want to elevate their performance, you have to start by mastering your own psychology.
You are the intervention.
Your internal state is constantly leaking out and regulating the nervous systems of those you lead.
If you want to elevate their performance, you have to start by mastering your own psychology.
You are the intervention.