Macros.AI

Every endurance workout burns a blend of two fuels: fat and carbohydrate. The mix shifts with your effort, your fitness, and the day. Most apps show you pace, power, and calories. Macros.AI shows you the one thing they don't: what your body actually burned, and what to do about it. HOW IT WORKS Connect your watch and Macros.AI reads the heart-rate data from each workout, then estimates how much of your energy came from fat versus carbohydrate across the session. No lab test, no extra hardware. You get a clear breakdown you can use, plus AI that turns it into plain-language insight. WHAT YOU GET - A fat-vs-carb fuel split for every workout, in plain numbers - A clean breakdown of where your energy came from - AI insights that explain what your fuel mix means and what to focus on next - Trends over time, so you can watch your aerobic base develop - A way to compare workouts side by side - Shareable cards for your runs, ready for Instagram, Messages, and more WHY IT MATTERS Burning more fat at a given effort is one of the clearest signs your aerobic engine is improving. If you train in zones, do long slow distance, fuel for races, or just want to understand your own physiology, the fuel mix is the signal you've been missing. Macros.AI makes it readable at a glance. CORE FUEL DATA IS FREE Your core fuel breakdown for every workout is free. Macros Pro unlocks AI interpretation, sharing, Compare AI, Trends AI, and additional insight into what your numbers mean over time. Start with free access and upgrade when you're ready. WORKS WITH YOUR GARMIN Macros.AI connects to your Garmin account so your workouts sync automatically. Connect once and your runs show up. Macros.AI provides fitness and training information based on estimates from your heart-rate data. It is not a medical device and does not provide medical advice. Terms of Use: https://www.joinmacros.com/terms Privacy Policy: https://www.joinmacros.com/privacy