HR Trainer supports you in exercising within a defined Heart-Rate (HR) range.
👉🏻Tap the min and max values on your watch to set your range. If your HR drops or exceeds these values, your Fitbit watch will continuously vibrate to let you know.
This app is free of charge.
Let me know what you think! Visit my website ➡️https://smtz.watch and tell me, if this app is useful or how it can be extended.