I use it mainly to track my Squash workouts. The heart rate tracking on Fenix is very finicky. It often stays in 120s for the first 30 mins or so (my actual heart rate during that time is usually in 160s), then becomes slightly more responsive and shows a peak usually in 160s (my real max heart is in 190s during an intense game). Virtual race predictor is a new feature on the Fenix 7. On the sensor front, there are heart rate monitors and Garmin's Pulse OX sensors across the board, though the Fenix 7 series includes Garmin 1. You can set the watch up so it starts capturing heart rate from the chest strap even if you are not recording an activity on the watch. 2. You can update the heart rate graph in connect with the data from the ride so that the daily/weekly training on resting/high heart rate takes into account these externally recorded activities. Here is my comparison of HR data from the chest strap and OHR. Garmin Fenix 7S gave up to -59 bpm difference in HR data compared to the chest strap. Here is my comparison for my night’s average HR with Oura. Seems to be that Garmin misses a lot of spikes in HR (Oura has studies of its accuracy like this If you've noticed that your Garmin watch has started giving you some strange heart rate readings, you're not alone. Following a recent software update, several Garmin Fenix 7 owners have reported anomalous readings during the day, with their recorded heart rate appearing to suddenly jump or drop by as many as 30 beats per minute, and stay there for a few seconds before returning to normal, for PbojW.