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Pace Puffin is an AI running coach: it reads your watch's training and talks with you in Claude or ChatGPT.

What you need

A watch that records your runs, such as a Garmin, COROS, Polar or Suunto, syncing to its own account. Heart rate helps your coach most.
A free Intervals.icu account with that watch account connected: your coach reads your training from it. Not Strava: runs that reach Intervals only through Strava can't be read.
Claude or ChatGPT, with your own account, on a plan that can add a custom connector (in ChatGPT, Plus or higher).
An invitation, for now: during the beta, setting up starts from an invite link. Ask for a spot.
To be 18 or over (terms of use).

About ten minutes, all on the setup page your invite link opens:

Intervals.icu. Sign up, connect your watch's account in Intervals Settings, and choose Download old data for the last year, so your coach meets you knowing your training.
Your Intervals API key, from Intervals Settings → Developer Settings. The page checks it as you paste and says how many runs Intervals holds. The key opens your whole Intervals account: the coach only reads your training and, after you say yes in a chat, changes planned workouts.
Your app. The page shows your coach's address and the steps for Claude or ChatGPT: you add it as a custom connector named Pace Puffin. Keep the address to yourself: it works like a password.
Your first sync. Your coach reads your history: 5 to 30 minutes, depending on how many runs you have. The page says when it's done.
Get started. In a new chat, choose + → Pace Puffin → Get started in Claude, or say Get me started in ChatGPT. Your coach reads back what your training shows, asks what it can't see, and plans your first week.

Check in. Ask for today's check-in and say how you feel: your legs, your sleep, any pain. Your coach looks at your recent runs and recovery and suggests today's session.
Ask about your training: how a run went, whether you're on track for your race, what has changed.
Plan. Your coach suggests workouts and changes, and changes the planned workouts in your Intervals calendar only after you say yes.
New runs reach your coach by themselves: it can see a run minutes after it reaches Intervals, and has it analysed within about half an hour. Ask your coach to sync now if you can't wait (up to 3 a day).
Your goal race and profile change when you tell your coach and confirm. Ask it what it keeps about you at any time.

Your coach doesn't know about a run. Check the run is in Intervals.icu, from your watch's own account rather than Strava. Then ask your coach to sync now, and come back in half an hour.
Your app can't reach your coach, or its tools are missing. Claude: check Pace Puffin is connected under Settings → Connectors, and switched on for the chat. ChatGPT: open the Pace Puffin plugin and refresh it. A new address can take a minute to work.
You lost your coach's address, or want your coach in your other app: ask Justyn through your coach for a new address, which replaces the old one.
Something your coach says looks wrong, such as a pace, a distance or a date: tell your coach, which sends your words to Justyn once you say yes.
Pain, illness or injury. Tell your coach, which takes it into account, and see a professional: your coach is not medical advice.
You want to stop. Tell your coach you want to leave. To cut your coach off at once, regenerate your API key in Intervals (Settings → Developer Settings).

Still stuck? See Support.