You'll need your smart phone with you, and it's possible that this approach might work in some very limited situations. Their approach is to get with the data from a local weather station using the Bluetooth connection to a smart phone, and then use the heading to calculate your current windspeed. Generally, air resistance is incorporated through pace, but Garmin actually attempt to include wind speed. Strangely, Garmin's running dynamics system doesn't report on any braking force, though obviously it's able to detect horizontal acceleration. Garmin referred to this as "horizontal oscillation" though most Running Sensors referred to this as the braking force. This is because the balance of a runner is more like bouncing a ball there's some effort involved, but there's also a lot of elastic bounce as well. The relationship between vertical oscillation and effort ( Running Economy) is not really valid. It seems intuitively obvious that the effort of bouncing up and down needs to be included in a running power, the science doesn't back this up. Running intensity is proportional to pace, and generally proportional to incline, but the relationship between intensity and running downhill is rather more complex. Like any other running power meter, GRP estimates power primarily from your running pace and the slope. To get any meaningful data out of GRP, you'll also need a Footpod, preferably Stryd (more on that later.) (It supports the Fenix 5/5S, but those models appear to have hardware issues with sensors.) You also need a sensor that supports Garmin's Running Dynamics, which is available embedded in a heart rate strap or a clip-on pod. In fact, it will only run on the Garmin 935, Garmin Fenix 5X, and Garmin Chronos. The software for Garmin Running Power (GRP) is their Connect IQ data field, but unfortunately, it won't run on any Connect IQ enabled Garmin watch. Garmin's Running Power Meter is a software download for their existing hardware, rather than a new hardware product.
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