It’s no secret that I like Xert (pronounced EXERT).
In a nutshell, it’s a novel way of looking at what power output you are capable of at any given instant; and that knowledge feeds through into many aspects of training from season planning, to workouts or to segment hunting. It works well in the Garmin CIQ environment for both running and cycling power but has limitations when you are a triathlete using both.
More on the science: link to xertonline.com
Today’s News
I tend to favour the web view of Xert but, today, Xert has announced new functionality for their iOS users
- New Adaptive Training Program view (See where you are in your training program and how many hours you’ll need to train each week to improve)
- Update your goals and settings right from the app
- Review your progress with a new Stats view of your data (Distance, Training Loads, Threshold Power, Calories/Fat/Carbs, etc)
- Adjust your power data (perhaps for one specific power meter or for indoor usage)
Resources:
I mention Xert quite a lot (as its cool) in these links at the5krunner.com, where I separately look at their cadence optimiser, their ‘what’s my FTP app’, their adaptive workouts and their segment hunter.
if you want one place, although the info is now a little old, then try Dcrainmaker’s review: link to dcrainmaker.com from 2017.
There is free stuff at Xert, including free & USEFUL stuff as well ! But there is also some paid-for stuff after a free trial. If you sign up there I get nothing from it…just sayin’.
Last Updated on 21 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.
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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
