Within the Exercise App, after choosing workout type, you can turn "Heart Zone Notifications' on or off; these vibrate when changing the defined heart rate zones. After selecting your exercise type, swipe up from arrow at bottom of screen to see these settings. Rather than the zones based on your heart rate and age, you can set one individual zone - not sure but suspect that zone would cause similar vibration when entering or leaving.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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