Transition × COROS: Your Training, Now in Sync

Transition now integrates with COROS. Structured run, bike, swim, and strength workouts go straight to your watch, completed activities sync back and match to your plan, and overnight HRV and resting heart rate feed your recovery. WHOOP and Suunto are in testing.

Alex Wormuth

Transition × COROS: Your Training, Now in Sync

Today we shipped Transition's COROS integration. Connect your watch in Settings → Connected Accounts, and your planned workouts go to your wrist while your completed activities come back on their own.

Why this matters

Most training apps leave you the logistics. You read the session on your phone, enter the intervals into your watch, train, then export a file so the app can tell you how it went. None of that is training. It's overhead, and it's the overhead that quietly erodes consistency.

With COROS connected, there's nothing to carry between the two. Tuesday's threshold set is on your watch before you leave. You press start and follow it. When you're done, the activity arrives in Transition, matches to the workout it was meant to be, and your coach analyzes it against what you were asked to do.

What syncs

Workouts to your watch. Structured run, bike, swim, and strength workouts are sent to COROS, scheduled on the date they're planned for. Intervals and targets arrive as a real structured workout. (Functional tests stay in the app, where the protocol needs your full attention.)

Activities back to your plan. Completed COROS activities sync automatically and match to your training plan. We read your COROS data natively, so it arrives at full fidelity rather than second-hand through another platform, and takes priority over a downstream copy of the same session.

Recovery signals. Overnight HRV and resting heart rate flow in and inform your recovery guidance, weighed against your own baselines rather than population averages.

One note on that last point: we're not reading sleep from COROS yet. Their current API exposes when you went to bed and when you got up, but not how much of that you were asleep — and time in bed is not sleep duration. We'd rather show nothing than a number that's quietly wrong, so COROS contributes HRV and resting heart rate, and sleep stays with the sources that measure it. If COROS exposes a true sleep-duration field, we'll add it.

Your COROS data, in Claude too

Transition has been a Claude connector since April. Connect COROS to Transition, connect Transition to Claude, and it works from there too.

Ask "how did this week's runs go?" and Claude reasons over your COROS activities alongside your plan. Or say "send Tuesday's ride to my watch" — Claude pushes the structured workout through Transition, and it's waiting when you head out.