How I Built a Personal Training Coach in One Week

Note: This article reflects information as of April 2026. Introduction "What if I had an AI coach that knows all my Garmin data?" That thought sparked Stride Mate — a personal training coach app. The first commit was on April 17th, and one week later it has Square billing, Garmin online sync, and a usage dashboard running. This is the 7-day development journal. What is Stride Mate? Stride Mate ( https://stride-mate.vercel.app ) is an AI coach you talk to via LINE, backed by your Garmin training