Scientists measured cardiovascular fitness in 1.2 million 18-year-olds, then followed them for 10-36 years.
The fitter they were, the more likely they were to:
1) score higher on intelligence tests
2) earn a university degree
3) reach a higher-status job
Do your cardio.
"Until death, all defeat is psychological." - Marcus Aurelius
Refuse everything that would lead most people to give up.
Refuse it.
Rise from the dead 1000 times.
Commit to never stay down & never give up.
Everything you want is on the other side of struggle.
Cardinals third-round pick Carson Beck said that his right arm, which the quarterback injured in 2024, is the “strongest it's ever been.”
Story via @joshweinfuss:
https://t.co/efNUxJCsoJ
Happy to have played a small part in the process with @WillHewlett over the years. @QBCoachMcEvoy built the foundation and has continued to carry it on. Happy for Malik!
How you talk to yourself matters.
In one study on lifting weights, goal directed self-talk "enhanced performance by 43% once an RPE of eight was reached, resulted in 63% more repetitions, and demonstrated more efficient muscle activation patterns."
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Shiny object syndrome: the tendency to be easily distracted by new, fashionable ideas or opportunities, often at the expense of current projects or long-term systems and goals.
I can't believe it took 2.5 years...but my paper on a new system for rating foods by nutritional value was finally accepted for publication!
Nutrient-dense foods like fish, meat, and non-starchy vegetables top the list.
Caffeinated coffee (but not decaf) is associated with a lower dementia risk and better long-term cognitive function.
2–5 cups of caffeinated coffee/day (~380–650 mg caffeine) = 19% ⬇️ dementia risk vs. 0 cups/day.
Caffeinated coffee drinkers also had better subjective cognitive function scores at higher intakes. Similar associations seen for tea.
This is one of the most important studies in sleep science.
Van Dongen et al. ran the experiment that changed how we understand chronic sleep restriction. They had subjects sleep 4h, 6h, or 8h nightly for 14 days, testing cognitive performance every 2 hours.
The 6h group’s reaction time deficits by day 14 matched subjects who had been awake for 24 hours straight. The 4h group? They performed like someone awake 48 hours.
But here’s what makes this study terrifying.
The Stanford Sleepiness Scale ratings in Panel B plateau after day 3-4. Subjects stopped feeling more tired even as their cognitive performance continued deteriorating through day 14. Your subjective experience of fatigue is a lagging indicator that eventually just… stops updating.
This explains why chronic undersleeping feels sustainable. You’ve adapted to feeling tired. Your prefrontal cortex hasn’t adapted to being impaired.
The PVT (Psychomotor Vigilance Task) in Panel A measures lapses in attention. These are the moments where you’re staring at a screen and your brain simply checks out for 500ms. Every additional day of 6h sleep adds more lapses. The curve never flattens.
Panel C and D show working memory and processing speed. Same pattern: continuous degradation with no subjective awareness.
The practical implications:
If you’re sleeping 6h and think you’re functioning fine, you’ve lost the internal calibration to know you’re not. The subjects in this study would have told you they felt “okay” while performing like they’d pulled an all-nighter.
For anyone doing cognitively demanding work, this means you cannot trust how you feel. You need to track objective markers: error rates, decision latency, problem-solving throughput.
Sleep need is biological, not negotiable. Most adults require 7-9 hours, and the research shows no population-level adaptation to chronic restriction. “I only need 6 hours” is almost always “I’ve forgotten what baseline cognition feels like.“