If you’ve spent any time on fitness podcasts or social media lately, you’ve heard about Zone 2. It’s been called the secret to longevity, the key to fat loss and the training every endurance athlete swears by.
Like most things that go viral, there’s a good idea at the centre of it, wrapped in a fair bit of hype. So let’s strip it back and talk about what Zone 2 actually is, why it’s worth doing, and how it fits into a normal week of training.
What is Zone 2?
Exercise intensity is often split into “zones”, from very easy (Zone 1) up to flat-out (Zone 5). Different systems use slightly different numbers, but Zone 2 sits towards the easier end. It’s steady, comfortable effort that you could keep up for a long time.
In heart rate terms, it’s often described as roughly 60–70 per cent of your maximum heart rate. In practical terms, it’s the pace where you’re breathing a bit harder than normal, you’re warm and moving with purpose, but you could still chat to the person next to you in full sentences.
Think brisk walk up a gentle hill, an easy bike ride, a relaxed jog or a steady session on the rower. Not a stroll, and definitely not a sprint.
Why it’s worth doing
Zone 2 training builds your aerobic base. That’s the engine that powers almost everything you do, from walking up the stairs to recovering between rounds in a HIIT class.
When you train regularly at this steady intensity, your body adapts in some really useful ways:
- Your heart gets more efficient. It pumps more blood with each beat, so it doesn’t have to work as hard.
- Your muscles get better at using oxygen. Over time they develop more of the machinery that turns fuel into energy.
- You get better at using fat for fuel. That helps you go longer before you tire.
- You recover faster. A bigger aerobic engine means you bounce back more quickly between efforts and between sessions.
Better cardiovascular fitness is also strongly linked with better long-term health. That’s a big part of why Zone 2 has become the darling of the longevity crowd.
The other big selling point? It doesn’t beat you up. Because the intensity is moderate, you can do a fair amount of it without wrecking your legs or your recovery for the next day.
How to find your Zone 2 without a lab
You don’t need a fancy lab test to train in Zone 2. There are a few simple ways to find it.
The talk test. This is my favourite, because it’s free and works for everyone. If you can talk in full sentences but you wouldn’t want to sing, you’re probably in the right spot. If you can only get out a few words at a time, you’ve gone too hard. If you could belt out a song, pick it up a bit.
Nose breathing. Many people find that if they can keep breathing comfortably through their nose, they’re in about the right range.
Heart rate. If you’ve got a watch or chest strap, you can use 60–70 per cent of your max as a rough guide. Just remember the classic “220 minus your age” formula for maximum heart rate is a ballpark at best, and it can be well off for some people. Use the numbers as a guide, and use how you feel as the reality check. (More on that in Your Watch Isn’t Your Coach.)
Zone 2 should feel almost too easy. That’s the bit most people get wrong.
The most common mistake I see is people turning every “easy” session into a medium-hard one. They head out for a gentle jog, catch someone in front of them and suddenly they’re puffing. That middle ground leaves you tired without getting the full benefit of either easy or hard training.
How it fits with harder training
Here’s where I want to bring a bit of balance back into the conversation. Zone 2 is great, but it’s not the only thing you need.
A lot of endurance coaches follow a simple pattern: most of your cardio is easy, and a smaller portion is genuinely hard. You’ll often hear it described as roughly 80/20. The easy work builds the base. The hard work pushes your top end and gives you a big fitness boost in a short time.
For the average person training a few times a week, I’d keep it simple:
- Strength training two or three times a week. It’s non-negotiable for long-term health.
- One or two harder sessions, like a HIIT class or a hard interval workout.
- Some steady Zone 2 work, like a longer walk, ride, swim or jog, or an easy session on the bike or rower.
You don’t need hours of it to see a benefit. Even 30 to 45 minutes a couple of times a week is a great start, and you can build from there. Australia’s guidelines recommend 150–300 minutes of moderate activity a week, and Zone 2 sessions fit neatly into that.
Making it enjoyable
The biggest challenge with Zone 2 isn’t physical. It’s boredom. Holding back for 40 minutes takes patience.
A few ideas to make it easier:
- Do it with a friend. The talk test takes care of itself.
- Get outside. A walk or ride around the harbour beats staring at a wall.
- Listen to something. Save your favourite podcast for your Zone 2 sessions.
- Make it your commute. Walking or riding to work is Zone 2 training that doesn’t eat into your day.
Most importantly, don’t overthink it. You don’t need the perfect heart rate or the perfect gadget. Move steadily, keep it comfortable, do it regularly and let it build your engine over time.
Then, when it’s time to go hard, you’ll have the fitness to really go for it.
For the other end of the scale, read HIIT: How Hard Is Hard Enough?
