Coach Casey

For marathon runners with a date on the calendar

Plans know the run.
Casey knows the runner.

Connect Strava. Keep the plan you’ve already got. Coach Casey reads every run, remembers the season, and writes back like someone who’s actually paying attention.

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Invite-only while we’re in early access.

Exhibit A · after Thursday's run

After the run, a read.

What the run actually meant, not just the numbers on the watch. From a coach who's been paying attention, seven minutes after it synced.

Read by Casey · 06:31

Strava sync · Thu 06:24Debrief

10 km around the park

Pace
4:58/km
Heart rate
142bpm
Distance
10.0km
Week so far
42km

15s quicker than where your easy lives. on a Thursday?

Quicker than an easy run usually lives for you. 4:58 against a usual 5:13. Heart rate stayed low, so nothing physical. But the plan wanted easy to be easy.

You mentioned the calf on Tuesday. Easy runs are where you bank that signal, and 4:58 is harder to justify if it’s still talking. Not my call. But worth sitting with before tomorrow.

the calf again. April was the same side.

№ 01What a plan can't know

The life around the runs.

A plan is a prescription. It can't read what came before, what came after, or the day you actually had. Casey holds the rest of the picture, and brings it to every read.

  • TueCalf felt tight on the cooldown.noted.
  • WedWork trip, landing late Thursday.seen.
  • ThuKids up at five. Again.factored.
  • Plan says8 × 3:00 tempo, Friday.hmm.
should i swap tomorrow’s tempo given the calf?

Plan wants 8×3 tempo. But the calf’s been talking since Tuesday and you land late tonight. Not the week to push through something that’s already whispering.

I’d swap for an easy 45 and take the tempo to Saturday. Your call.

Casey · 21:42 · read the whole season before answering

№ 02Memory, in practice

It remembers what you’d remember.

Months later, in the middle of a different conversation, the right detail comes back. Not because it was tagged. Because it mattered.

April 14 · you, in chat

“Pulled up sore on the left calf around the 8k mark. Backed off.”

four months,
held.
August 22 · Casey, long-run debrief

“Calf chatter on the descent at 19k. Same side as April. Worth keeping an eye on, not worth panicking about.”

№ 03The hidden part

Sharper, the longer it knows you.

Most of what makes a coach good isn't in your Strava data. It compounds. The type below is doing what the product does.

Week 1

Reads your runs. Catches the obvious.

Month 3

Knows your easy isn’t the book’s easy. Remembers the calf from February.

Month 12

Knows which races matter, the way you unravel in February, the patterns you didn’t know you had.

№ 04How it works

Three things, once. Then nothing.

Five minutes of setup, then keep running the way you already were.

  1. 01

    Connect Strava. Tell Casey the goal.

    Upload the plan, paste it, describe it. Whatever you’ve got. Five minutes, once.

  2. 02

    Run the runs you were going to run.

    No new app during the workout. No daily check-in. Casey reads each run as it lands, against the plan and everything before it.

  3. 03

    Read what Casey has to say.

    A debrief after every run. A review at the end of every week. Chat, whenever you want to dig in.

№ 05Fit, stated plainly

Honestly, who it’s for.

Coach Casey sits alongside the plan you've already got and reads every run against it. It doesn't write you a new plan. That fits some runners and not others. The honest split, below.

For youyes, go

  • A marathon with a date on itthe season pointed at one start line
  • Your runs land on Stravawhere Casey does its reading
  • A plan you mostly trustfrom a coach, a group, an app, a book, yourself
  • You want a read, not a rewritethe plan stays yours, the attention is new

Not for youtruly, it’s fine

  • No race on the horizonCasey reads a season against a goal. no goal, no read
  • Your coach already hears about every runif you debrief together three times a day, you’re covered
  • You want the plan written for youplenty of tools do that. this isn’t one
  • Old school, off the appsno Strava, nothing to read

Appendix · asked first

Asked, answered.

The questions that come up before signing up. Answered honestly.

Will Coach Casey write my training plan?

No. Coach Casey reads what you're already doing. Your plan, your runs, what's been going on around them. Then writes back like a coach paying attention. The plan stays yours, or your coach's, or your group's.

Do I need to log workouts somewhere new?

No. If your run shows up on Strava, it gets debriefed. No second app on the run, no morning check-in.

What if my plan changes mid-block?

Update what you tell Coach Casey, the same way you'd tell a coach. The next debrief reads against the new plan. Memory of the old block stays. Pacing, fatigue patterns, what worked.

How does it get sharper over time?

It accumulates the context that Strava data alone can't capture: which races mattered, which weeks bent, what your easy actually looks like in July. Three months in, you'll feel the difference. By month six, the recall starts surprising you.

Where does my data go?

Strava data comes in through their API. The only thing written back is the verdict line, one sentence under each debriefed run's description, which you can turn off in settings with one tap. Your runs, plan, and chat history are stored on Supabase, in Tokyo. Coach Casey uses large language models to write debriefs and respond to you; your data is never used to train them.

How do I get access?

Coach Casey is invite-only while we're in early access with a small group of marathoners. Request access from the homepage with your name and email, and we'll send you a link to sign up.

Who built it

Built by a runner who got tired of generic.

“I wanted the read my own coach gives me. On every run, not just the ones we talk about.”

Coach Casey started as a private tool I built to debrief my own runs while training for the Melbourne Marathon. I’m a coach. I’m also a coached athlete. I wanted the read on each run that my own coach gives me, specific and in context, between sessions, on every run.

It’s a one-person product so far. I read every support email myself. I use Coach Casey on every run I do, including the ones I’d rather forget.

Jason Hunt, Sydney

One training block. See if it earns its keep.

We’re letting in a handful of marathoners at a time. Leave your details and we’ll send you a link to get started.

Request early accessInvite-only for now. We’ll send you a link.
© 2026 Coach Casey, SydneyPrivacyTermsFAQAdminkm 42.2, you finished. nice one.

Strava is a trademark of Strava, Inc. Coach Casey is not affiliated with Strava. Built by Jason Hunt in Sydney.