Take a look at the Troubleshooting section below and check the FAQs, you might find immediate answers to your questions there.
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Troubleshooting
I don't understand how I can add workouts
It is currently not possible to log workouts with the Streakout app, you'll need a third-party app for that, e.g. Apple Fitness, Ōura, Nike Run Club, Garmin Connect, etc.
My workouts do not show up
Please make sure you are not excluding the Activity Type under Settings → Tracked Activities. Walking is excluded by default, but can be enabled.