Polar has just announced that Polar H10 strap owners can now get real-time running feedback on their running form (skiing too).
First up, use Polar BEAT to double-check that you have set your H10 to be able to broadcast two lots of BLE signals. That way you can still use it with your running watch+H10 whilst you pair the other BLE channel to the RaceFox app on either iOS or Android. As you run, you can squirrel your phone away somewhere and use the audio queues and audio feedback from the app through your earbuds (connected to your smartphone).
RaceFox is a paid-for service and costs Kr39/$11/£10 per month (ish). However, everyone can get a free tryout of the service from this link.
Here are some screenshots from the app and they look to provide similar information that you might get from Runscribe Plus or Garmin’s HRM-TRI/run. It IS nicely presented though.
However, you can’t yet get ski feedback from Garmin so RaceFox has a slight edge here…for now. Apparently, ski dynamics will be available imminently with the HRM-PRO chest strap but obviously, HRM-RPO will be a relatively expensive initial purchase compared to a few months of usage from RaceFox.
Opinion
We knew a LONG time ago that Polar had some clever electronic bits inside the H10 and we wondered how they would be used. I guess now we know. This is a sensible move by Polar as their limited resources are best focussed elsewhere and a 3rd party like RaceFox is better positioned to deliver something to perhaps rival or beat Garmin. However sporty-gadget history is littered with failed apps and hardware that endeavours to make money out of running form so good luck to RaceFox – probably only Garmin & Runscribe have (relatively) prospered by adopting focussed strategies for the future.
Here’s a video…
https://youtu.be/zH1f6RJ1whY
Last Updated on 22 January 2026 by the5krunner
My favourite kit and nutrition
- Maurten — the race nutrition trusted by elite athletes. Gels and drink mix engineered to be easy on the stomach.
- Garmin 90-degree charging adapter — the small adapter that keeps your charging cable tidy at the stem. Essential for race day.
- Garmin charging puck — the fastest and most reliable way to top up your Garmin before a session.
- Ravemen FR300 — front light that mounts directly under your Garmin or Wahoo head unit. Keeps your bars clean and your beam pointed where it matters.
- Garmin Varia RTL515 — radar rear light that alerts you to vehicles approaching from behind. Pairs with your Edge or Garmin watch.
- Stryd — the footpod that brings running power to your Garmin. The single most useful running upgrade I have made.
- Favero Assioma Pro RS2 — the power meter pedals most serious cyclists end up choosing. Accurate, easy to move between bikes.
Reader-Powered Content
This content is not sponsored. It’s mostly me behind the labour of love, which is this site, and I appreciate everyone who supports it.
Support the site: Follow (free, fewer ads) · Subscribe (paid, ad-free) · Buy Me A Coffee ❤️
All articles are written by real people, fact-checked, and verified for originality. See the Editorial Policy. FTC: Affiliate Disclosure — some links pay commission. As an Amazon Associate, I earn from qualifying purchases.
tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
I wonder if Polar is calculating any of the metrics on the strap or if they’re sending a raw data stream that RaceFox does the calculations on. If they’re doing some on the strap, I wonder what the odds are they’ll enable the ANT+ HR-RD profile so we can use an H10 and get RD data on Garmin watches natively.
i’d say the odds are against it.
but having said that polar probably have the best strap…so to make it as accessible as possible is only going to help them.
i should know the answer to the calcualtion question…but don’t…sorry!
Based on readme here – https://github.com/polarofficial/polar-ble-sdk the strap sends accelerometer data, so it’s probably calculated on the phone.
thumbs up emoji
Renee from Racefox. We take the raw accelerometer data from the Polar H10 and do the calcuation in our App which is available for Android/iOS smartphones and the Apple Watch.
I recommend everyone interested in learning about their running form, give Racefox a try. As far as we know we are one of the first real-time audio coaches that offer in-the-moment feedback on form and technique. Very helpful for those who want to work with deliberate practice.
We are also do a lot of research on injury prevention and returning from injury: https://www.racefox.com/en/blog/racefox-press-release-injury-prevention