Zone 2 training: a practical guide

Zone 2 is the unglamorous training that quietly builds the biggest engine. Most people skip it because it feels too easy — which is exactly why it works.

What Zone 2 actually is

Zone 2 is easy, conversational aerobic exercise — roughly 60–70% of your heart-rate reserve. You should be able to hold a full conversation. It's the pace that builds your aerobic base, improves how well your muscles use fat for fuel, and increases mitochondrial density — all with a low fatigue cost, so you recover quickly and can do a lot of it.

Calculate your zones from your age and resting heart rate below.

Why it matters

• Builds the base. A bigger aerobic engine supports everything else — harder intervals, faster races, better recovery between gym sets.
• Low cost, high return. Because it's easy, you can accumulate volume without digging a recovery hole.
• Health & longevity. Aerobic fitness is one of the strongest markers of cardiovascular health (see how to improve your VO₂ max).

How to do it

1. Pick a steady activity — easy running, cycling, rowing, brisk incline walking.
2. Hold the talk test — full sentences, nasal breathing comfortable. If you're gasping, slow down.
3. Go long, not hard — 30–60 minutes is a typical session.
4. Be patient — early on you may need to slow right down (even walk) to stay in zone. The fitter you get, the faster your Zone 2 becomes.

Where it fits

Keep easy days easy and hard days hard — the polarised approach. Pair Zone 2 with the right amount of high intensity, and you build a durable, high-performing engine. Our athletic-performance programme sets your real zones from your Garmin and Strava data and balances easy and hard work for you.