AI FOR SPORT · ENDURANCE · Nº 301 · EDITION 1 · LAUNCHING SOON

LUND CARDS · AI FOR SPORTNº 301 PROPOSED

THE CARD AS TEXT · FOR EYES AND FOR MACHINES

THE TRAIL RUNNER · the trail running seat · a lifelong trail and mountain runner

WAKES WHEN someone wants a lifetime in the sport beside them — how it is learned, trained and lived, and the sums from their own numbers — or is planning a trail day or an ultra's logistics — the route, its climb and its cut-offs, the drop bags and the crew sheet, the mandatory kit list; time-on-feet and grade arithmetic from the runner's own past efforts; a course profile read plainly.

THE LOOP

Say who is here: a life in the sport
Ask: your numbers, the rules, the date
Answer as an athlete; use the machine
Prove: working shown, sums land
Write the ledger: built · failed · next

NEVER

Calls a route, a river crossing or a weather window safe
Navigates for someone
Hand off: the race director for the course, a clinician for the body; the plan stays the runner's own.

IT MAKES pace, speed and a finish time, the clock at every aid station against the event's own cut-offs, walking time two published ways, and the latest time to turn round, the weeks to the day, your log read back, the day planned back from the start, conversions.

THE STANDARD the race's own rules and mandatory-kit list; the land manager's rules for the trail.

IN THE BOX CARD.md · SKILL.md · TIN.md · START-HERE.md · references/A-LIFE-ON-THE-TRAIL.md · references/THE-ARITHMETIC.md · scripts/trail.py · WITNESS.md · SELFTEST.md · MY-LEDGER.md · LICENSE-NOTE.md · MANIFEST.md · AUDIT.md · card.json · card.svg · card-machine.svg · card.html · the doors (HOSTS.md · system/ · rules/ · mcp/).

PROOF SELFTEST 21/21 · witnessed in Claude 2026-09-18 · Edition 1.

THE SEAL 98 of 100 · LEGENDARY · WITNESSED · Trigger 5 · Machinery 5 · Law 5 · Portability 5 · Proof 5

THE PUNCH · SHA-256 OF SKILL.MD · 548D7F064DDEEA84E10B392C

THE FACE, FULL SIZE → · THE MACHINE FACE → · card.json →

THE TRAIL RUNNER

the trail running seat · a lifelong trail and mountain runner

THE MOUNTAIN DECIDES · THE MAP IS YOURS TO READ · FUEL IS DESCRIBED, NEVER PRESCRIBED

LEGENDARYWITNESSEDIN CLAUDE IN LUNDR IN CHATGPT

WITNESSED — the studio saw this card run and produce what its tin promises, and wrote the date down. What the marks mean →

What it is.

A card you give to your own AI so it becomes a lifelong trail and mountain runner. A runner who has spent a life on trails — forest loops after work, fell races, mountain marathons with a map, hundred-milers through two nights, crewing and pacing for friends, and turning round below summits more than once. It says how it would do a thing, shows every sum, and leaves every choice with you. It never calls a route, a river crossing or a weather window safe, and it never navigates for anyone. This is Edition 1.

Three laws, written into the card.

They are in the card itself, so the AI follows them.

THE MOUNTAIN DECIDESThe card never calls a route, a river crossing, a snow slope or a weather window safeThe card never calls a route, a river crossing, a snow slope or a weather window safe. Conditions and the runner's own judgment decide, the forecast and the race director outrank the card, and every mountain day carries a turn-around time set before the start.

THE MAP IS YOURS TO READThe card never navigates for anyoneThe card never navigates for anyone. It reads a route, a profile and a cut-off sheet back, and does the clock on them; the map, the track file and the runner's own skill find the way.

FUEL IS DESCRIBED, NEVER PRESCRIBEDHow runners eat and drink on long days is described from what is published; amounts for a How runners eat and drink on long days is described from what is published; amounts for a person, anything medical, and anything about weight are a clinician's or a registered dietitian's.

What rides in the card.

In the card’s own voice, with a machine that shows its working.

A LIFE ON THE TRAILthe sport, in its own voiceTrail is not road with dirt on it; Building for a long one; The plan for the day; Navigation and the hills; Ultras, crews and the night; Staying in it; The edges.

THE MACHINEtrail.py · 9 commandsEvery command prints its working, and a bad input is refused, never guessed. Assembled from the studio’s tested blocks, with its own selftest of 21 checks.

What it does once your AI has it.

Talks like someone who has done it all their life — trail is not road with dirt on it; building for a long one; the plan for the day; navigation and the hills — and ends with: that is how I would do it; you choose.
Does pace and finish times. 10 km in 50:00 is 5:00 a kilometre; 21.1 km at 6:00 finishes in 2:06:36.
Puts the clock on the course. Fifty kilometres in eight hours from 06:00 reaches 25 km at 10:00 — thirty minutes ahead of a 10:30 cut-off — and 40 km at 12:24, twenty-four behind a 12:00 one.
Estimates the day two published ways — 12 km with 900 m of climbing is 3:54 by Naismith and 5:12 by book time — plans on the longer, and sets the latest time to turn round: 12:30 for a 07:00 start and a 19:00 dark.
Lays the weeks to your day out, reads your log back, and plans the day back from the start — every minute a default you change.

What it will never do.

It never calls a route, a river crossing or a weather window safe, and it never navigates for anyone. It refuses to call a route, a crossing, a slope or a weather window safe. It refuses to navigate for anyone, or to tell anyone to go on past their turn-around time.

It cannot see you, the day or the place. A rule that belongs to a governing body or an event is theirs: you bring it, and it outranks the card. It recommends nothing by brand, never comments on anyone’s body, and pain, injury, food and medicine go to a clinician or a registered dietitian, said first. Hand off: the race director for the course, a clinician for the body; the plan stays the runner's own.

What’s in the buy.

CARD.md — the whole card: who it is, its three laws, when it says no, what it carries · SKILL.md — the door your AI reads first · START-HERE.md — the first five minutes, for you
references/A-LIFE-ON-THE-TRAIL.md + THE-ARITHMETIC.md — the craft in the card’s own voice, and every sum with its limit
scripts/trail.py — the machine: standard library only, selftest 21/21
WITNESS.md + SELFTEST.md — the run as it printed · MANIFEST.md, every file hashed · AUDIT.md, the twelve checks
MY-LEDGER.md — the card’s memory, on your own machine · TIN.md · LICENSE-NOTE.md
card.svg + card-machine.svg + card.json · card.html, the card as one offline file · the doors for ChatGPT, Gemini, Cursor and the rest, with a short door cut to fit their instruction boxes

PROOF · SELFTEST 21/21 · EVERY COMMAND ON THE RECORD · WITNESSED IN CLAUDE 2026-09-18 · EDITION 1 · PUNCH 548D7F064DDEEA84E10B392C

ON EVERY DOOR · A CARD FOR YOUR AI, A FILE FOR YOUR COMPUTER

In Claude: turn on code execution under Settings › Capabilities, then Customize › Skills › + › Create skill, and upload the zip as it is — START-HERE.md in the box walks you through it, and tells you how to keep the ledger. In ChatGPT, Gemini and the rest: a Project, a GPT or a Gem with the card’s files attached and the short door in the box pasted as its instructions. The words run anywhere an AI reads Markdown; the machines run wherever the host runs Python. Witnessed in Claude only. The host marks →

Take it.

Nº 301 PROPOSED — LAUNCHING SOON

Sold as is under the term printed. A card instructs an AI you operate; results depend on your model, your files and your judgement. Beside you, never the boss. Not legal, medical, tax or financial advice. The terms →

THE TERM · PICK YOUR WINDOW

LAUNCHING SOONTHE WEEKLAUNCHING SOONTHE MONTHLAUNCHING SOONTHE YEAR

LAUNCHING SOON. A term is a window of editions: every edition of this card issued inside it replaces your file. When the window closes, the file you hold keeps working — freeze, not loss. Nothing auto-renews.

A TERM, NOT A SUBSCRIPTION: NOTHING RENEWS ITSELF AND NOBODY IS CHARGED AGAIN. WHEN A TERM ENDS THE FILES STAY ON YOUR COMPUTER AND STAY READABLE — FREEZE, NOT LOSS.

THE MACHINE · IN THE OPEN · FROM THE WITNESSED RUN OF 2026-09-18

trail.py, every command showing its working.

A small Python program, standard library only. Your AI runs it; you can too. Every block below is pasted from the card’s own WITNESS.md, as printed.

`pace`	pace and speed from a distance and a time
`finish`	a finish time from a distance and a pace
`clock`	the clock at each point, against the event's own cut-offs
`walktime`	a walking-time estimate two published ways
`turnaround`	the latest time to turn round
`calendar`	the weeks to the day, the rows left empty on purpose
`log`	date,minutes,what[,felt] — totals, by week, the longest, days active
`eventday`	the day planned back from the start
`convert`	km mi · m ft · kg lb · c f
`selftest`	21 checks that prove the arithmetic; it must print 21/21

pace · PACE 5:00 PER KM

pace       5:00 per km
speed      12.00 km/h · 7.46 mph
working    pace = time ÷ distance · speed = distance ÷ time

finish · FINISH 2:06:36 — 21.1KM AT 6:00 PER KM

finish     2:06:36 — 21.1km at 6:00 per km
working    time = pace × distance
plainly    an even pace on paper. Hills, heat, wind, water and the second half of any long day all have their say.

clock · # THE CLOCK · 50KM IN 8:00:00 FROM 06:00 — EVEN EFFORT ON PA

# THE CLOCK · 50km in 8:00:00 from 06:00 — even effort on paper

| point | at | clock | cut-off | margin |
|---|---|---|---|---|
| aid2 | 25 km | 10:00 | 10:30 | 30:00 ahead |
| aid4 | 40 km | 12:24 | 12:00 | 24:00 BEHIND |

working    clock at a point = start + time × (its distance ÷ the whole)
plainly    the cut-offs are the event's own, from its guide — you bring them. Real days are not even: climbs, dark and tired legs put you behind this sheet late on.

walktime · NAISMITH 3:54:00 — 5 KM/H ON THE FLAT PLUS AN HOUR FOR EVERY

Naismith   3:54:00 — 5 km/h on the flat plus an hour for every 600 m climbed
book time  5:12:17 — thirty minutes a mile plus thirty minutes for every 1,000 ft climbed
working    Naismith 1892: distance ÷ speed + ascent ÷ 600 m · book time (the American guidebooks' rule): miles × 0:30 + thousands of feet × 0:30
plainly    both are walking time for a fit party on a path, with no stops, no snow, no heavy pack and no descent penalty. Most days take longer.
           I would plan on the longer figure, add my stops, and set a turn-around time before I leave.

THE MATERIAL, NUMBERS AND DATES IN THESE RUNS ARE THE OPERATOR’S OWN EXAMPLES.

TRY IT IN ONE BREATH

Ask it anything someone who does this for a living would know.

YOUMy first 50 km has cut-offs at 25 and 40. I think I’ll take eight hours.THE CARDprints the clock at each aid station against the race’s own cut-offs, tells you the sheet runs fast early and slow late, and asks what your turn-around plan is.

YOUWhat would you do in my place?THE CARDtells you how it would do it, from a life in the sport — and then says the choice is yours.

YOUCan you write my plan?THE CARDtells you it lays your own plan on the calendar and does the sums; it does not write one, and it never gives orders.

QUESTIONS AT THE TABLE

Asked before the wire.

Can it see me, or where I am?

No. It works from what you tell it and from your own numbers. It never calls a route, a river crossing or a weather window safe, and it never navigates for anyone.

Will it write my training plan?

No. It tells you how people in the sport train and why, lays your own plan on a calendar, reads your log back and does the sums. The plan stays yours.

Does it know my event's or my league's rules?

No, on purpose. Rules change and differ; you bring the current ones, and they outrank the card.

Is it an app?

No. It is a small folder of files that plugs into the AI you already use. Nothing to install and no server; nothing you type leaves your machine because of the card — your conversation itself goes to the AI company you use, under their terms.

Can I buy it today?

Not yet. It is launching soon. THE RUNNER is the one card on sale today; this room is open so you can read exactly what the card is before it is.

Do I need Claude?

It is built for Claude first and has been witnessed running only there, because Claude can run the machine for you. The words work in ChatGPT, Gemini and the rest through the doors in the box.

Can my teenager use it?

With a parent in the loop. That is the rule for anyone under 18, on every card in the studio.

← ENDURANCE · AI FOR SPORT · beside it: THE RUNNER · THE HIKER · THE OBSTACLE RACER