ΔέσεThe 5 Heart-Rate Zones, explained simply
If you wear a sports watch, you've probably seen workouts full of "Zone 2", "Zone 4", or "150 bpm". For many runners those are just numbers. In reality, though, heart-rate zones are one of the most useful guides for training the right way.
What heart-rate zones are
Heart-rate zones split your training into 5 intensity levels, based on a percentage (%) of your maximum heart rate. Each zone corresponds to a different intensity level and triggers different adaptations in your body — some help recovery, some build endurance, others build speed. Knowing which zone you're in helps you stop running at the same pace every time, with no clear purpose.
What each one does
| Zone | % Max Heart Rate | How it feels | When to use it |
|---|---|---|---|
| Z1 · Recovery | 50-60% | Very easy, comfortable talking | Warm-up, cool-down, active rest |
| Z2 · Aerobic base | 60-70% | Comfortable, can hold a conversation | Most of your runs — builds endurance |
| Z3 · Tempo | 70-80% | Moderately hard, a bit breathless | Improves aerobic fitness & race pace |
| Z4 · Threshold | 80-90% | Hard, only a few words at a time | Raises your "speed endurance", lactate threshold |
| Z5 · Maximum | 90-100% | Very intense, only for a short time | Sprints / VO₂max intervals, speed |
Use our free Heart-Rate Zones Calculator.
What it looks like in practice
Zones aren't theory — this is how they show up in a real training week:
How much time in each zone
Ever finished an "easy" run feeling completely wrecked? You probably spent that time in Zone 3 or 4 when the goal was Zone 2 — without noticing, you "stole" intensity from a day that was supposed to be relaxed.
You don't need to split your time equally across the 5 zones. Most runners — even elite ones — spend most of their training at low intensity, keeping a small, targeted amount of time for the hard stuff. It's the same idea behind polarized 80/20 training.
👉 Read also: Why elite runners run slow on easy days.
Heart-rate zones aren't there to hold you back. They're there to show you when to slow down and when it's actually worth pushing. When every session has the right purpose, progress comes more steadily — with fewer injuries.
You don't need to chase perfect numbers. It's enough to know the goal of each session — and heart-rate zones are a simple way to hit that goal more often. 🏃♀️
3 things to remember
- Every zone has a different purpose — not all of them are about speed.
- 75-80% of your training should be in Zone 1-2.
- Find your own zones with the heart-rate calculator.