FAQ · PACER AI Running Coach
Everything you might want to know about PACER — an AI-native running coach.
What account system does PACER use?
Email account system with verification/password setup. Decoupled from watch data sources, supports multiple devices.
What is PACER?
An AI-native running coach built by a marathoner and independent developer, powered by a proprietary orchestrator and kinematics engine.
How is PACER different from a regular running app, or a ChatGPT wrapper?
PACER combines training data, pace and load calculations, a training knowledge base and runner preferences to support plan generation, conversational adjustments, weekly reviews and pre-run and post-run advice. Syncing updates training data; plans can be adjusted in conversation or after weekly reviews, rather than being rebuilt after every sync. Consider your actual physical condition when following advice. Improved performance and injury prevention are not guaranteed.
Which devices and data sources are supported?
Official COROS MCP direct connection: training data read supported (about 24 months), workout push supported (server-side delivery); Polar via official authorized direct connection: training data read supported; workout write-back not supported (vendor does not accept third-party workouts); Garmin via intervals.icu relay: activity sync supported, structured workout push supported; other brands connect via an intervals.icu relay; reading and workout-push support depend on intervals.icu's actual per-platform/per-device capabilities and device conditions (the membership page lists Garmin, COROS, Suunto, Wahoo and Zwift as conditional examples). Your account password is never stored; the WeChat mini program is currently not supported.
What training science is PACER built on?
Daniels VDOT (E/M/T/I/R pace zones), Hansons cumulative fatigue, 80/20 polarized training, and Banister TRIMP fatigue quantification.
Does PACER cost anything?
New users get a free trial covering VDOT assessment and plan generation (trial length subject to the actual in-app rules); an advanced membership follows. As of 2026-11-03 the membership page shows ¥99/year (the crossed-out ¥199/year is a comparison display, not a verified historical price); no auto-renewal; within 7 days of payment a refund is available minus a 1% payment-channel fee. Figures reflect the membership page display and are subject to the latest in-app terms and the Membership Service Agreement.
What can I use after my trial or membership expires?
You can still view existing plans and training records, manually sync data, export plans and read previously generated weekly reviews. AI coach chat, new plans and adjustments, new reviews and training advice, plan delivery through supported channels and proactive email reminders require an active trial or membership.
How do I get started?
Register or sign in with email at run2ai.cn, then connect a supported data source. PACER is a Web app available in a phone or desktop browser.
Can I run this model in my own AI tools?
Use the open-source ai-running-coach Skill in compatible MCP/Skill tools with your own model, data authorization and runtime. Its features, integrations, costs and generated results may differ from the hosted PACER service.
How does PACER protect my data?
Data comes from sources you authorize: official COROS MCP, official Polar authorization, or intervals.icu for other supported devices. PACER does not store device-platform passwords. Missing data limits advice; AI can be wrong and injury advice does not replace medical diagnosis.