The Foundations of Heart Rate Variability course enrolment is closing in March. There’s a discount code if you want to sign up to it (Coupon code ‘TFK’). This could be an interesting course if you’ve ever wanted to take your use of HRV to the next level.
https://hrvcourse.com/learn-more
As you may be aware, the Autonomic Nervous System (ANS) is a key player in your health and performance and one of the primary contributors to Heart Rate Variability. The problem is there are dozens of values that fall under the umbrella of “HRV” and dozens of devices/apps/systems that measure it one way or another. Oftentimes HRV is a complex, pro-like subject and many consumers take different routes to get the same data such as those looking for sporting readiness insights from WHOOP 4.
The course presents a logical progression from the ground up on the key science and mechanisms underlying HRV, as well as how to actually use this powerful biomarker in real-world situations. It is completely app/platform neutral, so whichever platform you use, you’ll have a much clearer path forward.
The curriculum is said to be geared towards health professionals, coaches, trainers, and even athletes who want to quantify and improve their own systemic condition.
As mentioned, it’s closing soon and is not open often:
https://hrvcourse.com/learn-more
Use coupon code “tfk” to get 10% off at checkout.
Last Updated on 13 January 2026 by the5krunner
My favourite kit and nutrition
- Injinji – Runners protect your toes. Avoid discomfort and minor injury. Run more. Run faster. I use them.
- Garmin 90-degree charging adapter — The small adapter that keeps your charging cables tidy. Essential for race day. I use one.
- Garmin charging puck — the fastest and most reliable way to top up your Garmin before a session. I use one.
- 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. I use one.
- Body Glide – The blue anti-chafe stick that all swimmers and many runners use. I use it.
- Maurten — The race nutrition trusted by elite athletes. Gels and drink mixes engineered to be easy on the stomach. I use them.
- Garmin Varia RTL515 — A radar rear light that alerts you to vehicles approaching from behind. Pairs with your Edge or Garmin watch. I use this model.
- Favero Assioma Pro RS2 — The power-meter pedals most serious cyclists choose. Accurate, easy to move between bikes. I use this model.
- Garmin Forerunner 970 — A serious choice for a pro-grade triathlon watch. I use this.
- Polar H10 — My daily driver for accurate, waking HRV readings.
- Wahoo ELEMNT Roam 3 — The bike computer that has the feature Garmin lacks: usability. I use mine on most rides.
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 can confirm the android app is (still) free… Been shifting around hard sessions around it and seems to work…
Cheers “AS”. After about 2 years of using it you’ll get bored and want a wrist-based 246 HRV monitor…if only one, other than WHOOP, existed.
I dont use a chest strap everyday. And yet i regularly forget to take off the Polar strap I use with Elite HRV when i am up and then go running with a Suunto watch… and since i am too lazy to pair that strap on that watch i basically end up runnning with a piece of “junk” on me…. Indeed we need an optical HRV…. sigh….
or a garmin where your strap can pair simultaneously to many things 🙁 I think the new versionof Bluetooth allows one to two pairing rather than one to one (could be wrong)