Couch to 5K on a treadmill:
yes, you can, and here's how

I'm James Gonzo, a beginner-friendly coach in Heywood, and I've been running for more than 30 years. If running outside in the dark, the rain or in front of the neighbours is the thing putting you off, this one is for you. Can you do Couch to 5K on a treadmill? Yes. The NHS says so in as many words, and this page covers how I'd set it up so the plan still works.

This isn't medical advice. If you're worried about your health before starting an exercise plan like Couch to 5K, the NHS says to speak to a GP first.

What the NHS says about treadmills

On its Get running with Couch to 5K page, the NHS says that if running outside isn't your thing, you can do your runs on a treadmill instead. That's all it says on the subject, so nothing about the plan changes. It's still nine weeks or longer, three runs a week with a rest day between each, and each run still starts with a 5 minute warm-up walk and ends with a 5 minute cool-down walk. The free NHS Couch to 5K app has a trainer's voice and times every run, so you don't need to watch the clock.

The NHS plan page is the one to follow for the actual run and walk times. I've checked it on 24 October 2026, and I'm not repeating the whole plan here. My printable Couch to 5K plan and run log has all nine weeks on a single sheet if you'd like it on the wall next to the treadmill.

Before you press start

Four quick checks, before Run 1:

1. Know how the belt stops. Find the emergency stop and the big stop button before you need them. Most machines have a clip or key for this, but the type varies, so check yours. If you're in a gym, ask a member of staff to show you.
2. Practise the buttons while you warm up. During your 5 minute warm-up walk, change the speed up and down a few times. By the time you reach the first run, your fingers know where the buttons are and you're not fumbling mid-interval.
3. Wear what the NHS suggests: comfortable clothes and running shoes that support your feet, plus a supportive bra if you need one. The NHS notes it's best to go to a running shop to get shoes fitted, but you don't have to spend a lot of money. I've listed cheaper kit in Couch to 5K kit under £50.
4. Keep your phone where you can hear it. The NHS app's trainer talks you through each run from your phone. Headphones are fine, and the NHS reminds you to be aware of your surroundings when you wear them, which still applies in a busy gym. I've compared the apps in Best Couch to 5K app UK.

What speed to set

The NHS doesn't give a speed, and neither does the plan. It says to go at a pace that feels right for you and to focus on time, not speed. So the answer is to pick a speed that suits you, not one a friend told you.

Here's how I'd find yours:

• Start slower than you think. The first running interval in Week 1 is only 1 minute. If it feels like hard work after 20 seconds, the belt is too fast.
• Use the short-sentence test. If you can still say a short sentence between breaths, you're about right. If you can't, ease off. This is my rule of thumb, not an NHS rule.
• Write your speeds down. Note the number you used for walking and for running, so you can repeat it. If a week feels hard, the NHS says it's fine to repeat a run or a week.
• Don't chase a number on the display. Week by week, the plan builds the time you spend running. Speed isn't part of it.

Should you use an incline?

You'll often see "set the treadmill to 1%". That comes from a real study, but it's worth knowing what it tested.

In 1996, Jones and Doust at the University of Brighton looked at nine trained male runners, running on a treadmill and on a level road. They noted that running indoors costs less energy than running outdoors at the same speed, because there's no air resistance. They found that a 1% gradient best matched the energy cost of outdoor running, at speeds between 10.5 and 18 km per hour, over about five minutes. At the two slowest speeds they tested, about 10.5 and 12 km per hour, a flat treadmill and a 1% incline both came out about the same as the road.

So, a small incline is a reasonable setting if you want your treadmill runs to feel closer to outdoor ones. But the study doesn't tell you what's best for a beginner. Those runners were trained, the speeds were fast, and your first Couch to 5K intervals are probably slower than the lowest speed they tested. If you're below 10.5 km per hour, you're outside what the study covered.

My advice: begin with the incline at 0% or 1%, whichever feels comfortable, and leave it alone for the first few weeks. Don't add hills to a plan whose whole point is building up gradually. The NHS says to do a similar run at least 3 or 4 times before you increase pace or distance, so change one thing at a time.

Doing the walk-run intervals on a belt

The walk breaks are the part that catches people out on a treadmill, because you can't just slow down and wander.

• Change the speed, don't step off. Press the speed down to a brisk walking pace for the walk interval, then back up for the next run. Practise this during the warm-up, as above.
• Keep the walk brisk, not a stroll. The NHS plan alternates running with walking, so you're moving the whole time.
• Stay in the middle of the belt and look ahead, not down at your feet. The NHS plan's Week 1 tips say to keep your head up, your back straight and your shoulders relaxed.
• Hold the side rails only if you need to. A light touch for balance when you change the speed is fine. Holding on all the way through changes how you run, so try to let go as you get used to the machine.
• Take small sips of water. The NHS says to take small sips when you need to, especially if it's warm. A gym can be warm.
• Use the cool-down. The last 5 minutes of the run is a walk. Don't skip it just because you're indoors.

Heading into week 5 on the belt? I've written about the 20-minute run in Week 5 Couch to 5K: Why the 20-Minute Run Feels So Hard.

Treadmill or outside: when to mix them

You don't have to choose one. If the weather is bad on a run day, do that run on the treadmill and the next one outside. The plan doesn't mind where your feet are. When you do head out in the cold, here's what to wear running in winter.

There's one thing to be aware of. Running outside means different surfaces, corners and the wind. If your goal is a parkrun or a 5K race, try to get at least some of your later runs outside so the real thing doesn't feel new. That's my suggestion, not an NHS rule.

If you finish Couch to 5K on the treadmill and want to know what to do next, my running page has a four-week plan for people already comfortable with easy runs.

Questions

Can you do Couch to 5K on a treadmill?

Yes. The NHS says that if running outside isn't your thing, you can do your runs on a treadmill instead.

Is treadmill running easier than running outside?

In the 1996 Jones and Doust study, a flat treadmill cost less energy than a level road at the faster speeds they tested, because there's no air resistance. At the two slowest speeds, the difference was too small to measure. That was nine trained male runners, so it doesn't tell you how it will feel for you. A 1% incline matched outdoor energy cost in that study.

Should I use a 1% incline for Couch to 5K?

It's a reasonable setting, but it isn't part of the NHS plan. Start at 0% or 1% and leave it alone while you build up.

What speed should I set for Couch to 5K?

The NHS doesn't set a speed. Pick one that lets you finish each run interval. If you can't say a short sentence, slow down. Note the numbers you use.

Can I use the NHS Couch to 5K app on a treadmill?

The NHS says you can do the runs on a treadmill, and the app times every run for you, so you don't need to keep track of the time.

Do I need a gym membership?

No. You need a treadmill you can use regularly. If you don't have one, the NHS plan works outside and costs nothing.

What if I miss a run?

Carry on when you're ready. The NHS says repeating a run or a week is fine.

Should I speak to a GP first?

The NHS says to speak to a GP first if you're worried about your health before getting started.

Sources, all read on 24 October 2026: NHS, Get running with Couch to 5K; NHS Couch to 5K running plan; NHS, Knee pain and other running injuries; BBC Sport, Q&A: Couch to 5k; Jones and Doust (1996), Journal of Sports Sciences.

What's the one thing putting you off outdoor running?

Cheers,
James