If JOIN detects a higher FTP or threshold heart rate in your Strava or connected platform data than what you have set in your profile, you will receive an alert suggesting you verify your numbers. The same applies as you progress through your training plan — if JOIN picks up signs of improved fitness, it will flag it.
Keeping your Cycling Level up to date matters. Your training plan is built around your current numbers, so outdated values mean workouts that are too easy or too hard. When you get an alert, it is worth taking a moment to check and update your FTP or threshold heart rate in JOIN.