How to get real coaching value from your training apps and wearables.
Critical Swim Speed is your sustainable threshold pace in the pool. Here is how to test it with two time trials, what it means, and how to build training zones from it.
FTP and Critical Power both estimate your sustainable cycling effort, but they are built differently. Here is how they diverge, how to test each, and which to use.
Normalized Power estimates what a variable ride really cost you, as if you had held a steady effort. Here is how it differs from average power, how it is calculated, and how it feeds intensity factor and TSS so your training load reflects reality.
A tempo run is sustained effort at or just below your lactate threshold - comfortably hard, holdable for 20-40 minutes. Here is what a tempo run actually is, how to find the right pace by feel, heart rate, and race times, and how to fit it into a week without turning every run into a grind.
Training Stress Score puts a single number on how hard a session was, combining duration and intensity. Here is how TSS is calculated for cycling, running, and swimming, what the numbers mean, and how it feeds the fitness and fatigue model that drives smart training.
Your Zone 2 heart rate is roughly 60-70% of your maximum heart rate, but the population formulas are off by 10-12 bpm for most people. Here is how to find your real Zone 2 range using max HR, the MAF method, lactate threshold, and the data already sitting in your Garmin, Strava, or WHOOP.
Most training plans break the first time life does. An adaptive plan rebalances around your recovery, your sleep, and the sessions you actually complete.
Your Apple Watch and iPhone already track everything. An AI coach reads your workouts, heart rate, sleep, and body data from Apple Health and acts on it.
Stop pasting screenshots into ChatGPT. Connect Strava, Garmin, WHOOP, Oura and more to Claude or ChatGPT so your AI actually sees your training data.
AthleteData's AI coach builds your plan and auto-syncs each day's structured workout to your Garmin or COROS watch, with on-device interval targets.
How to train with your menstrual cycle instead of against it - what the research actually shows, why your recovery scores swing, and how to use your own data.
Everything triathletes need to know about brick workouts - the physiology, the types, the progression, and how AI tracks your bike-to-run transition performance over time.
How to structure a 20-week Ironman training plan using AI coaching - from base through taper - with adaptive load management, recovery monitoring, and race-week preparation.
How AI coaching helps triathletes manage training load across three disciplines, identify limiter sports, program brick workouts, and optimize recovery at 10-15 hours per week.
A detailed, no-hype comparison of AI fitness coaching and human personal trainers. What each does well, where each falls short, what the research says, and how to decide what's right for you.
Your wearable knows when you've been drinking. Here's exactly what happens to your HRV, sleep stages, resting heart rate, and recovery scores after alcohol - from one drink to a big night out.
Body recomposition - losing fat while gaining muscle - makes the scale useless. Here's how to track it properly using body composition data, strength PRs, and AI coaching.
You're generating thousands of data points every day from your wearables and training apps. Most of it is noise. Here's what actually matters, what the science supports, and how to turn raw numbers into better training decisions.
Modern wearables track hundreds of data points per day. Most of it is noise. Here's the evidence on which metrics actually predict performance and recovery - and why looking at less data often leads to better results.
Your Garmin watch tracks activities, sleep, Body Battery, HRV, and training status. An AI coach reads all of it and gives you personalized training advice you won't find in Garmin Connect.
Garmin Coach offers free training plans for 5K, 10K, and half marathon - but it only scratches the surface of what your Garmin watch actually collects. Here's how an AI coach does more with the same data.
Hevy is a great workout tracker, but it doesn't tell you when to push harder, back off, or change your program. Here's how an AI coach fills that gap.
Heart rate variability tells you how your body is handling stress. Here's how to actually use it - what the science says, how devices differ, and a practical framework for adjusting your training based on HRV trends.
A research-backed guide to concurrent training - how to get strong and build endurance at the same time, what the science actually says about the interference effect, and how to program your training week.
Heart rate data turns marathon training from guesswork into a feedback loop. Here's how to use HR zones, cardiac decoupling, and recovery metrics to train and race better.
The Oura Ring tracks sleep stages, HRV, body temperature, and readiness. Here's how an AI coach uses that data to adjust your training day by day.
Your body sends warning signals before overtraining sets in. Here's how to read them in your HRV, resting heart rate, sleep stages, recovery scores, and workout performance data.
Periodization sounds like something only Olympic coaches worry about. It's not. Here's how to use simple training phases to get stronger, fitter, and more consistent - without a sports science degree.
Resting heart rate is the most accessible fitness and recovery metric your wearable tracks. Here's how to actually interpret RHR trends - what the numbers mean, what moves them, and how to use them to train smarter.
Sleep is the single most powerful recovery tool available to athletes. Here's what happens when you get enough, what breaks down when you don't, and how to use wearable sleep data to make smarter training decisions.
Strava tracks every run, ride, and swim you do. But it stops at showing you charts. Here's how an AI coach turns that data into training decisions.
Stop deloading every fourth week because a program told you to. Your body gives clear, measurable signals when it actually needs a deload - here's how to read them.
WHOOP gives you a recovery score every morning. An AI coach takes that score - plus HRV, sleep, and strain data - and tells you what to actually do with it.
Oura wins HRV accuracy, WHOOP wins the strain-to-recovery loop, Garmin wins long-term value. A detailed breakdown of what each measures, what they cost, and which one fits your training.
Most people think they're training in Zone 2 but are actually going too fast. Here's what Zone 2 really is, what the science says about its benefits, how to find your personal Zone 2 heart rate, and how to use data from Strava, Garmin, and other platforms to stay honest.