Stop Guessing How Hard to Work Out — Use Heart Rate Zones

Most people exercise at the same intensity every single time. They go at a pace that feels “hard enough” and call it a workout. The problem is that pace is usually Zone 3 — the zone that feels productive but is actually the least efficient for most fitness goals. Learning your heart rate zones changes everything.

If you sit at a desk for most of the day, this guide is for you.

You do not need a gym membership. You do not need workout clothes or a personal trainer or a complicated program. What you need is a clear picture of what sitting is doing to your body, a handful of simple tools to track what matters, and a starter plan that does not require you to turn your life upside down.