PSA: Look at the heart rate sensor of your fenix 5. Has it cracks like mine? If yes, it's a common problem. Send it to Garmin and get a free replacement. Do
Garmin launch Fenix 5 range of multisport watches | Cyclist
Garmin Fénix 5 HR Black Bracelet Jaune - 010-01688-02 - Multisports Watches and Outdoor GPS - IceOptic