Glance at the Activity app on your iPhone or Apple Watch. If your circles are lagging behind the Peloton workout you've just completed, you'll want to do a quick sync to bring everything up to date.
For example, you can see in the screenshot above that after finishing a 60-minute cycling class, my activity rings display no data from my workout.
Next you will need to view each workout you are trying to sync in your Peloton app.
To view your workout, open the Peloton app on your iPhone. Go to your profile to access the workout you'd like to sync. Select "View all" to open your history of completed workouts.
In the list of completed Peloton classes, tap the workout you'd like to sync to open it and view your workout statistics.
After you've viewed each workout you'd like to sync, close both your Peloton app and your Activity app on your iPhone. This will allow your Activity app to refresh when you reopen it and log your new activity.
Reopen the Activity app on your iPhone or Apple Watch to see your updated rings. Sometimes it may take a few minutes to see the circles sync with your Peloton, but it will be much faster than waiting for it to track.