RunZone: Your AI Zone 2 running coach. Slow down, get faster.

Hey Product Hunt, I'm Chase, the maker of RunZone. I built this because I kept running every run at the same medium-hard pace and stopped getting faster. Zone 2 training fixes that: run most of your miles slow enough to talk, and your aerobic base grows so every pace gets easier. The hard part is actually staying slow. So RunZone: - calculates your heart rate zones - builds a weekly plan for your goal (5K to marathon, weight loss or general fitness) - tells you in your ear when you drift out of Zone 2 - charts your pace at the same heart rate, so you can see it working - adds a Run Age, AI form check from a 10-second video, an AI coach and a meal scanner It's iPhone only for now. If you just want to try Zone 2, the free calculator on getrunzone.app works without the app. I'd love blunt feedback, especially from runners who've tried Zone 2 before. What made it hard to stick with?