Incline walking: is the 12-3-30 treadmill workout worth it?

Walk into almost any Australian gym and you'll see it: a row of treadmills tilted steeply uphill, with people walking at a steady pace, headphones in, not running at all. Incline walking has become one of the most popular workouts on social media, and this week a debate about it trended online, with gym-goers arguing over whether 30 minutes of incline walking after weights helps or hinders.

The best-known version is the 12-3-30 workout. So is it worth the hype? Here is what it involves, who it suits, how to start gently, and how the Thrive Health Band helps you see how your body handles it.

What is the 12-3-30 workout?

The name is the recipe:

12: set the treadmill incline to 12%.
3: set the speed to 3 miles per hour, which is about 4.8 km/h on Australian treadmills.
30: walk for 30 minutes.

There's no running and no intervals, just a steep, steady walk. It was popularised by a social media creator who found running on a treadmill daunting and wanted something simpler. It looks easy written down, but a 12% incline is steep, and plenty of first-timers are breathing hard within a few minutes.

What incline walking is good for

Walking uphill asks more of your heart, lungs and legs than walking on the flat, without the impact of running. That makes it a popular middle ground.

Heart and fitness. A steep walk can lift your heart rate into a moderate or even vigorous range. Australia's 24-hour movement guidelines suggest adults do 30 minutes or more of moderate to vigorous activity on most days. An incline session can count towards that.
Legs and glutes. Walking uphill works the backs of your legs, your glutes and your calves harder than walking on the flat.
Lower impact. Walking is gentler on joints than running, which suits people coming back to exercise or who don't enjoy running.
Simple to stick with. You don't need to learn anything new. You can listen to a podcast, catch up with a friend on the next treadmill, or just switch off.

Does incline walking after weights burn muscle?

This was the question that set off this week's debate. The short answer is that a moderate amount of walking is very unlikely to undo your strength training. Muscle is built through regular strength work, enough protein and enough sleep. Walking alongside that is generally fine.

Where it can go wrong is doing too much, too soon. Jumping straight into steep 30-minute sessions most days, on top of a full training week, can leave you sore and run down. If you also lift weights, our guide to starting strength training explains how to fit both in.

How to start incline walking gently

Fitness professionals generally suggest building up rather than starting at 12-3-30.

Warm up on the flat. Walk for five minutes with no incline before you tilt the treadmill.
Start lower. Try an incline of 1% to 4% and a speed that lets you hold a conversation.
Build time first, then hill. Start with 10 to 15 minutes, add a few minutes each week, then add incline.
Start with two or three sessions a week. A sudden jump in load can lead to overuse injuries.
Let go of the handrails. Holding on takes work away from your legs and can affect your posture. If you need to hold on, lower the incline.
Cool down. Finish with a few minutes on the flat.
Mix it up. Combine incline walking with strength work and other activities you enjoy. Our article on how much exercise you need covers the full picture.

Prefer the outdoors? Hills and bush tracks give you the same benefits. See our tips for easing into longer spring bushwalks.

How Thrive helps you track incline walking

Thrive helps you see how your body is responding, so you can build up at a pace that suits you. The Band has no screen, so you can keep your eyes on the treadmill, and the Thrive by Optihealth app shows the detail afterwards.

Log a treadmill session. Choose Treadmill as your workout type and see your heart rate across the session.
Heart rate zones. See how hard you were working. Our guide to heart rate zones explains what each one means.
Today's Load and Today's Vitality. See how your activity sits against your sleep and recovery each day.
Recovery insights. After a big session, the Recovery Estimate gives an estimate of how long until you're back to your usual baseline, so you know whether to go again or take an easier day.
Steps and activity. Your incline walks add to your daily movement. Here's how many steps a day is a good aim.
Body composition. Take a manual reading by touching the metal plate on top of the Band with a finger from your other hand, then watch the trend over weeks rather than days.
Ask Thrive. Try "How has my resting heart rate changed since I started incline walking?" or "Do I sleep better on days I walk?"

Thrive also learns what is usual for you across nine areas of your health, from what the Band measures and what you log, and keeps track right across your health, including HRV, temperature, sleep, stress and mood, meals and Food Fit, blood tests, medications and supplements and your medical history.

If you'd like support, Thrive Loops lets you share selected information with a participating trainer, health professional or someone you trust. You decide what to share and with whom, and you can change or revoke access at any time.

When to talk to your GP

If you're new to exercise, have a heart condition, joint or back pain, or another health condition, check with your GP or a physiotherapist before starting steep incline work. Stop and seek advice if you feel chest pain, dizziness or unusual shortness of breath. Thrive isn't a diagnosis, but Ask Thrive can line up your heart rate trends and activity history, and you can show your Thrive trends to your GP. Here is how to use Ask Thrive before a GP appointment.

Before you buy

You'll need a compatible iPhone or Android phone, because the Thrive app is on the Apple App Store and Google Play, in Australia and eight other countries. The app stores are only for downloading the app, though; they aren't where you buy the Band or a Plan. You can buy at thrivehealthband.com, or at a participating World Gym Australia location or health and wellness clinic.

The Thrive Health Band is A$660 for the first year under the launch offer. That includes the Band, which is yours to keep, and 12 months of the Thrive by Optihealth app, My Health on the web, Health Fingerprint, Ask Thrive, Thrive Loops and your data, paid once upfront. Prices are in AUD and include GST. Free Australia-wide shipping during the launch offer (usually A$14.99).

Nothing renews automatically. After your first year, you can get a new band plus 12 more months for A$660, or keep your band and renew the Thrive Connected Plan for A$240 a year, or A$29 a month with no lock-in.

You're also covered by a 12-month Thrive Care Warranty, and consumer guarantees under Australian Consumer Law always apply. See Returns if something is wrong with your purchase.

Common questions

What is 12-3-30 in km/h?

Set the incline to 12% and the speed to about 4.8 km/h, then walk for 30 minutes. If you're new to it, start with a lower incline and a shorter time.

Is incline walking better than running?

Neither is better for everyone. Incline walking is lower impact and easier to start, while running builds fitness in a different way. The best choice is the one you enjoy and can keep doing.

Can Thrive track a treadmill workout?

Yes. Choose Treadmill as your workout type in the Thrive app to see your heart rate across the session, then check how you recover afterwards.

For more answers, see Questions.