September 2026

Older Black runner examining the timeline inside a Garmin FIT file after an easy run

What Is a Garmin FIT File? The Runner Behind the Summary

A Garmin activity summary shows the result. The FIT file holds the timeline underneath it. Here’s what that file can tell an AI running coach, what it can’t know, and why the runner’s own report still matters.

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What Is a Garmin FIT File? The Runner Behind the Summary Read Post »

AI Running Coach Experiment, Running After 50: Testing & Data
Magnus comparing a Strava activity summary with a contextual AI running coach analysis after a humid run

What Strava Missed About My Run, and My AI Running Coach Caught

Strava saw my fastest average pace of the month and two “intervals.” CoachChat saw a humid endurance run, a failing chest strap and enough late-session cost to hold the next week steady. The difference wasn’t smarter AI. It was better context.

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What Strava Missed About My Run, and My AI Running Coach Caught Read Post »

AI Running Coach Experiment, Running After 50, Testing & Data
Magnus considering whether an AI running coach should continue or adjust his running plan

When to Adjust a Running Plan: My AI Coach’s Smallest-Sensible-Change Rule

An adaptive running plan should respond to real evidence without rewriting the week every time one number looks odd. Here’s the rule I’m testing with CoachChat during my BlackToe Holiday 10K build.

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When to Adjust a Running Plan: My AI Coach’s Smallest-Sensible-Change Rule Read Post »

AI Running Coach Experiment, Running After 50: Testing & Data
Magnus reviewing an AI running coach prompt after a run using Garmin data, effort and personal context

My AI Running Coach Prompt: What I Report After Every Run

A watch can record the run, but it cannot explain the run. Here is the post-run debrief and copyable prompt I use to connect Garmin evidence, effort, symptoms and real life to the next AI coaching decision.

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My AI Running Coach Prompt: What I Report After Every Run Read Post »

AI Running Coach Experiment, Running After 50: Testing & Data
Colourful no-added-sodium meal with lemon, herbs, garlic, mushrooms, spices, olive oil and toasted seeds

Do You Wanna Cut Salt? How I Make No-Added-Sodium Food Taste Complete

I do not want to add sodium when I cook. That’s the rule I’ve settled on in my own kitchen. Table salt, sea salt, kosher salt, potassium-chloride substitutes and MSG are all off the table. So are high-sodium sauces or seasoning blends sneaking in through the side door. That doesn’t mean every ingredient I eat

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Do You Wanna Cut Salt? How I Make No-Added-Sodium Food Taste Complete Read Post »

Health & Wellness, Longevity
Older Black runner reviews a seven-movement strength framework for runners over 50.

Minimum Strength Training for Older Runners: My Seven-Movement Framework

The internet can give an older runner hundreds of “essential” exercises. I used AI to help reduce the noise to seven movement needs, then kept the exercises I will actually do.

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Minimum Strength Training for Older Runners: My Seven-Movement Framework Read Post »

Longevity, Running After 60, Strength & Mobility, Strength Training

How I Use ChatGPT as My AI Running Coach at 67

I am not asking ChatGPT to spit out a generic 10K plan. I am building an ongoing coach and athlete workflow that connects each prescription to my Garmin FIT data, subjective feedback and the next training decision.

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How I Use ChatGPT as My AI Running Coach at 67 Read Post »

Ouch to 10K, Running After 50, Running After 60, Training Tips
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