The latest articles on DEV Community by Leon Zajchowski (@leonzzz435). https://dev.to/leonzzz435 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3591895%2F1cbaa5a2-9a9f-4392-b8fc-0c6a9f184168.png https://dev.to/leonzzz435 en Leon Zajchowski Fri, 31 Oct 2025 20:36:50 +0000 https://dev.to/leonzzz435/how-i-built-an-agentic-ai-coach-that-turns-garmin-data-into-a-training-partner-364h https://dev.to/leonzzz435/how-i-built-an-agentic-ai-coach-that-turns-garmin-data-into-a-training-partner-364h <p><strong>Intro:</strong><br> I’ve been building an open-source project called <strong><a href="https://github.com/leonzzz435/garmin-ai-coach" rel="noopener noreferrer">Garmin AI Coach</a></strong> — a multi-agent endurance coach that analyzes Garmin health and activity data to generate adaptive training plans for triathletes, cyclists, and runners.</p> <p><strong>What makes it special:</strong><br> It’s not just another fitness tracker dashboard. It’s an <em>agentic AI system</em> that actually interprets your physiological data (HRV, sleep, stress, load) and drafts a transparent, auditable plan you can inspect line-by-line. Every insight is reproducible — no black-box “trust us” recommendations.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Foyisub4uebfqdaxsm6ux.webp" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Foyisub4uebfqdaxsm6ux.webp" alt="The architecture of my AI ‘company.’ Data flows in, and two teams — the Nerds (Analysis) and the Coaches (Planning) — work together to create a perfect training week." width="800" height="283"></a></p> <p><strong>How to contribute:</strong></p> <ul> <li>🧠 Help improve the agent reasoning or planning prompts.</li> <li>🧩 Add new data connectors (Thryve, Garmin Health API, or Connect IQ).</li> <li>🧪 Build demo datasets so new users can run the tool without real credentials.</li> <li>🖼️ Create front-end visualizations for the generated HTML reports.</li> </ul> <p>Issues labeled <strong><code>good first issue</code></strong> are beginner-friendly. I’d love to mentor new contributors, especially anyone interested in AI workflows, sports science, or wearable integrations.</p> <p><strong>Why I’m passionate:</strong><br> As a triathlete and data scientist, I wanted a coach that explains <em>why</em> it suggests what it does. Garmin AI Coach is my attempt to merge transparency, personalization, and open science.</p> <p><strong>Links:</strong><br> 🔗 GitHub — <a href="https://github.com/leonzzz435/garmin-ai-coach" rel="noopener noreferrer">leonzzz435/garmin-ai-coach</a><br> 📰 Medium story — <a href="https://medium.com/@leon_zajchowski/i-fired-my-garmin-coach-and-built-an-ai-to-train-for-an-ironman-70-3-heres-what-happened-09a404cecd78" rel="noopener noreferrer">“I Fired My Garmin Coach and Built an AI to Train for an Ironman 70.3”</a></p> devchallenge hacktoberfest opensource agents