Connecting Strava (and other sources)
Connect Strava under Profile → Connections → Connect with Strava. Once connected, Runsei imports your runs automatically (new activities arrive within minutes; you can also pull in your history). Every run brings its splits, route and heart rate, which feed your zones, training load and execution scores.
Apple Health and Health Connect are the other way in, under Profile → Data sources, and they are the only sources that also bring recovery — sleep, HRV and resting heart rate. Once connected, those arrive on their own each morning and Runsei stops asking you to type them in. (Garmin, COROS and Suunto direct connections are still on the way; any of them can reach Runsei through Strava in the meantime.)
You can disconnect or reconnect any source at any time from the same screen — every connection is reversible in-app, and all data sources are optional.