How the relay actually works
If you race off Polar data, you want a coach that can read your training load, not just admire it. Here is the part most pages skip: Wellness Project has no direct line to Polar and there is no Polar MCP server. What it has is a read on the health hub your phone already keeps, and Polar Flow already writes into that hub.
Polar Flow syncs your watch, then writes workouts, heart rate, and sleep into Apple Health on iPhone or Google Health Connect on Android. Wellness Project reads that hub, structures the raw entries into a clean training history, and exposes it to Claude and ChatGPT through a single MCP connection. Nothing is copied out of Polar into a partner API. The chain is simple and worth stating plainly: Polar to Apple Health or Health Connect to Wellness Project to Claude or ChatGPT.
Set it up in four steps
You are wiring three links: Polar Flow into the hub, Wellness Project onto the hub, and the AI onto Wellness Project. Do them in order.
Let Polar Flow write to your phone's health hub
In Polar Flow, enable the connection to Apple Health (iPhone) or Google Health Connect (Android) and grant it permission to write workouts, heart rate, and sleep. Flow is the intermediary here, the hub is where Wellness Project will look. Sync your watch once so recent sessions land in the hub.
Connect Wellness Project to that hub
In Wellness Project, connect Apple Health or Health Connect and grant read access to steps, workouts, heart rate, sleep, and HRV. Wellness Project now reads whatever Polar Flow deposited and turns it into a structured, queryable history.
Add the Wellness Project MCP connector to Claude or ChatGPT
Add Wellness Project as a connector in Claude (via MCP) or ChatGPT (via the plugin). This is the only AI integration involved, and it is the same one connector regardless of which watch fed the data. There is no separate Polar step on the AI side.
Ask your training questions in plain language
Ask Claude or ChatGPT how your weekly load is trending, whether your easy runs are actually easy by heart rate, or how sleep tracked against your hardest sessions. The AI reads your structured Polar history and answers against it.
Once those three links are live, you never touch the pipe again. New sessions flow from watch to Flow to hub to Wellness Project on their own schedule.
Why the relay beats a direct integration you do not have
An endurance base loves Polar because the training-load and heart-rate work is honest. The relay keeps that honesty. Because Wellness Project reads the same hub your phone already trusts, there is no fragile partner API to break, no OAuth token to expire on the Polar side, and no separate account to babysit.
The tradeoff is freshness, and it is worth naming: this path is only as current as Polar Flow's sync to the hub. That is fine for coaching over weeks and blocks, which is where training decisions actually get made.
Put your Polar training in front of an AI coach.
Relay Polar through Apple Health or Health Connect into one AI coach that reads your whole training history. Free during early access.