The evidence, written plainly.
Short pieces on the studies behind each rule in the plan, and on the claims the category makes that the evidence doesn't support. Every number carries a named source.
Training around a bad night: what sleep loss changes about today's session
The barbell doesn't know you were up at 3 a.m. Your effort meter does. What one short night actually changes about today — by the numbers.
Zone 2 or VO2 max first? How to split your cardio minutes
Athletes keep about four in five cardio minutes easy. You don't have an athlete's week. What the split evidence says about spending 60, 90, or 150 minutes.
RPE, translated: what “listen to your body” actually means
“Listen to your body” is useless advice until someone hands you the dictionary. RPE is the dictionary: a 1-to-10 scale anchored to reps you can count.
Training for the decades: the four capabilities worth programming for
Abs are a twelve-week goal. Being able at 70 is a program. The four capabilities the mortality data keeps pointing at — and how a normal week can hold all of them.
Wearable recovery scores: what “readiness” is actually made of
Your watch grades your morning with one number. The ingredients are public science. The recipe is not. Here is what the score is built from, and which parts have earned your trust.
Do fitness apps work? What the adherence trials found
Trials say apps get people moving — for a while. The honest numbers: an early bump, a steep drop-off, and the quiet features that outlast the novelty.
The minimum workout log: what's worth writing down
Four items per session — exercises, load times reps, one effort number, one note. Why that line is the working part, and why most of the rest is noise.
How accurate is your watch? Steps, heart rate, and sleep
The validation studies rank your watch's numbers: steps good, pulse decent, calories bad, sleep stages a rough sketch. Here is the honest league table.
Does tracking workouts actually change results?
Writing it down is one of the best-tested tricks in behavior science. The effect is real, modest, and dies the moment the log stops feeding a decision.
How to build a workout routine around the time you actually have
Most plans start with the training and hope the calendar cooperates. This one starts with the minutes you can defend, then buys the best training they afford.
VO2 max: the number that decides what you can do at 70
Your aerobic ceiling, in one number: what it is in plain language, where you stand by decade, how to estimate it without a lab — and how hard it tracks with the long game.
Testosterone: what a normal number is at 35, 45, and 55
The honest reference range is three and a half times wider than any clinic ad admits — and age moves the number far less than weight does. What the reference studies actually found.
Power fades twice as fast as strength
Strength is how much you can lift. Power is whether you catch the kid coming off the couch — and it leaves first.
The 3 PM crash is your lunch talking
The afternoon dip is partly built into your biology — but the size and shape of lunch decides how hard it hits. Plain food fixes most of it; a 10-minute walk fixes the rest.
Blood pressure: the first number that drifts
Nearly a third of men under 40 already sit above the line, and most haven't felt a thing. What the two numbers mean, why one office reading is noise, and what training measurably does.
The 90-minute meal prep
One Sunday session, five weekday lunches, 35–45 g of protein in every container. The math, the timeline, and the honest food-safety fine print.
Sauna and cold, ranked by evidence — not by podcast
Heat has a 21-year Finnish cohort behind it. Cold has small soreness trials and a documented bill after lifting. Here's what the literature actually supports, and in what order to care.
Bad knees is not a diagnosis
The evidence on running, quad strength, and stairs points the same direction: the joint that gets loaded is the joint that lasts. What the avoidance actually costs.
Stress is a training load
A brutal work week slows the same recovery your squats depend on — measurably. One ledger, one column, and the arithmetic for adjusting a program around a loud life.
Lifting before breakfast: what fasted training actually changes
The garage session happens at 5:30 a.m. or it doesn't happen. Here's what training on an empty stomach costs you — and the short list of cases where eating first actually wins.
Revenge bedtime scrolling: the stolen hour
You're exhausted by 9 and somehow still on the couch at midnight. The research has a name for it, a cost sheet for it — and a better fix than deleting the one hour that's actually yours.
The bad-back protocol: train around it, not through it
Most back pain has no identifiable culprit, scans of pain-free adults look alarming, and the evidence keeps pointing at movement. A plan for the week your back goes out.
Snoring is data
Most snoring is noise. Some of it is a flag for obstructive sleep apnea — common in middle-aged men, tightly linked to weight, and worth one honest conversation with a doctor. Here is the line between the two.
Carrying your kid is training: the loaded-carry math
The energy cost of hauling a toddler, measured by the same science that studies soldiers under rucksacks — and why the carry is the most dad-compatible conditioning there is.
HRV: what your watch is actually measuring
The gaps between your heartbeats, the math your watch runs on them, and why the number only means something compared with your own baseline.
The floor test: get up without your hands
Sit down on the floor, stand back up, count what you touched on the way. One number tracks with survival over the next decade — and everything it flags is trainable.
Broken sleep: the interrupted-nights protocol
What fragmentation actually costs, what to protect when the night is already lost, and what a wrecked night really does to the next morning's session. Written for the parent at the bedroom door, not the biohacker.
Grip strength: the longevity number you can test in a doorway
One squeeze of a dynamometer tracks with lifespan more strongly than blood pressure does. The norms by age and sex, the honest truth about dead-hang standards, and how grip gets trained by accident.
Two drinks: what alcohol actually does to your sleep
The nightcap is a loan against the second half of the night. What Friday's beers do to REM, heart rate, and the 3 a.m. wake-up — in verified numbers, without the lecture.
Muscle after 40: how fast it goes, and the minimum that keeps it
The drift is measured, and the floor is cheap: what the sarcopenia literature says about loss per decade — and the smallest weekly dose with a documented effect.
Ferritin: what it is, and what the number reflects
The storage form of iron, the lab value that stands in for it, and why tired lifters keep hearing about it. Plain numbers, no panic.
ApoB: the particle count your cholesterol panel hides
LDL tells you how much cargo. ApoB counts the trucks. Why lipid researchers keep saying the truck count is the number that matters.
hs-CRP: the inflammation number, explained
One protein, one number, and a surprisingly honest read on how calm your system is running. What the categories mean and what moves them.
HbA1c: your three-month sugar average
One number that summarizes ninety days of blood sugar — no fasting required. What it is, why it beats a single glucose reading, and what moves it.
Vitamin D: what the 25-hydroxy number means
The sunlight hormone, the blood test that stands in for it, and an honest read of a hyped literature. Plain numbers, both directions.
Sleep debt: what you can pay back, and what you can't
The part you can recover, the part you can't, and why weekend catch-up only pays half the bill.
This vs. that: rice bowls, burritos, and the 40-gram lunch
The same fast-casual order, built three ways, priced against the per-meal protein anchor. Generic math from the USDA database — no brands, no villains.
The weekly set budget: how many sets actually build muscle
Sets per muscle per week is the currency of growth. The floor, the solid-return zone, and the line where extra sets turn to junk.
How much deep sleep do you actually need?
The number your watch shows, what the labs actually measure, and why you protect the window instead of chasing the stage.
Creatine: the boring supplement that actually works
The one supplement with a mountain of evidence behind it — the dose, the water-weight truth, and why the fancy versions are marketing.
The caffeine cutoff: half-life math for real schedules
Your afternoon coffee keeps working long after you stop noticing it. The cutoff is arithmetic, not willpower.
10,000 steps is marketing: the number that matters
The target came from a business slogan, not a trial. Where the mortality curves actually bend — and why steps are a floor, not a goal.
The nap window: napping without wrecking the night
Short and early beats long and late. The duration that clears the fog, the timing that spares your night.
Light or heavy: what rep ranges actually change
Near failure, light and heavy build the same muscle. Heavy buys one specific thing. The zone is wider than the feed sells.
Melatonin: the right dose is smaller than the bottle
It buys minutes, not hours — and the milligrams printed on the label are the least reliable number in the store.
Maintenance calories without an app
Two honest ways to find the number — a formula you can do on paper, and a bathroom scale that outranks it. No wearable required.
Sore or hurt? What DOMS is, and when pain means stop
The soreness schedule, why the first session back bites hardest, and the plain difference between sore and hurt.
Losing fat and building muscle at the same time: the recomp math
Recomposition is documented, not myth. The deficit line, the protein lever, and who actually gets the friendly math.
Rest days: how many you need, and what counts as rest
Recovery is per-muscle, not per-body — how to space hard sessions, and why a rest day doesn't mean the couch.
The 30-gram fiber target, hit cheaply
The strongest boring numbers in nutrition, and a grocery list that gets you there — beans, bags from the freezer, fruit with the skin on.
Resting heart rate: the free recovery metric you already wear
What normal looks like, what moves it overnight, and why a week of mornings beats any single reading.
Zone 2, translated: the minimum dose of easy cardio
Conversational pace, counted in minutes. The weekly target, the dose-response curve, and why your mouth beats your watch.
20-minute dumbbell sessions that actually progress
Three moves, three days, one pair of dumbbells — and a progression rule that survives your worst week.
The recovery hierarchy, ranked
Where sleep, food, massage, and the cold plunge actually land — ranked by evidence, not by feed.
Protein math for people who cook twice a week
The daily target, split across meals you'll actually eat. Plain numbers, no powder required.