Training zones help turn exercise into a more structured system. Instead of guessing how hard to work, athletes use zones to guide recovery, endurance, threshold work, and top-end speed.
In fitness, not every session should feel the same. Some workouts are designed to help the body recover, some build endurance, and others improve speed and power. Heart rate training zones provide a clear framework for understanding this — dividing exercise intensity into five levels based on effort.
The Five Zones
| Zone | % Max HR | Session Range | Main Benefit |
|---|---|---|---|
| 5 · Maximum | 90–100% | 10 sec – 3 min | Neuromuscular power, top-end speed, short explosive intervals |
| 4 · Hard | 80–90% | 2 – 25 min | Lactate tolerance, speed endurance, threshold intervals |
| 3 · Moderate | 70–80% | 10 – 40 min | Aerobic power, stronger circulation, tempo-style efforts |
| 2 · Light | 60–70% | 20 – 80 min | Aerobic endurance, fat oxidation, base for harder training |
| 1 · Very Light | 50–60% | 20 – 40 min | Active recovery, light movement after harder sessions |
Zone 1 is the easiest level of effort, mainly used for active recovery. It allows the body to keep moving without adding much extra stress. Useful after harder training days when the goal is circulation and reducing fatigue.
Often seen as the foundation of endurance training. It strengthens the aerobic system and helps the body use energy more efficiently over time. Many endurance athletes spend a large amount of training time here.
Sits in the middle and feels controlled but clearly challenging. Helps improve aerobic power and is often used for steady tempo work. Too much training here can leave athletes stuck between easy endurance and harder threshold work.
Where training becomes demanding. Helps the body tolerate harder efforts and maintain faster paces for longer. Commonly used in structured interval workouts, hill repetitions, and race-focused training blocks.
The highest intensity — only sustainable for short periods. Targets explosive efforts and is used for sprint work, HIIT, and short intervals. Places the greatest demand on the body, so it's used in smaller doses.
How to Use Zones
Calculate Your Zones
HRmax = 220 − age
The simplest and most widely used method. Gives a quick estimate of maximum heart rate — good starting point, best treated as an estimate.
Target HR = Resting HR + (Max HR − Resting HR) × Intensity
Uses resting heart rate too, making it more personalised. Better for people who want tailored training zones.
| Zone | Heart Rate (bpm) |
|---|---|
| Zone 1 · Very Light | 96–116 |
| Zone 2 · Light | 116–135 |
| Zone 3 · Moderate | 135–154 |
| Zone 4 · Hard | 154–174 |
| Zone 5 · Maximum | 174–193 |