How to start running when you're unfit
Start by walking, not running. Once brisk walking feels manageable, add short running intervals inside the same session: 60 seconds of running, 90 seconds of walking, repeated for about 20 minutes. That's the actual structure NHS Couch to 5K uses for week 1, and it works because the running part is short enough to manage even if you haven't exercised in years.
A smaller unit than a run makes this manageable: short bursts of jogging inside a walk, building up slowly enough that the plan sets the pace for you.
Your first two weeks
If you're not doing any regular exercise right now, the first stretch isn't about running intervals yet. It's about getting your body used to moving on a regular schedule. Once that feels normal, week 1 of NHS Couch to 5K adds the run-walk intervals.
| Stage | What you do | How often | Session length |
|---|---|---|---|
| Not currently active | Brisk walking only, no running yet | Most days of the week | 20 to 30 minutes |
| Ready for intervals (NHS Couch to 5K, week 1) | Run 60 seconds, walk 90 seconds, repeat 8 times | 3 sessions a week, with a rest day between each | About 30 minutes door to door, including a 5-minute warm-up walk and a 5-minute cool-down walk |
The walking-only stage isn't part of the official NHS plan. It's a buffer for anyone who finds even week 1's running intervals daunting. WHO and ACSM ask adults for at least 150 minutes a week of moderate-intensity activity, and WHO's 2020 guideline range runs from 150 to 300. The 20 to 30 minutes most days above is this page's own way of splitting that across the week. Neither body publishes a daily figure.
Why run-walk intervals instead of just running
The 60-second run, 90-second walk split isn't arbitrary. NHS Couch to 5K's week 1 session is exactly that pattern, repeated, wrapped in a 5-minute warm-up walk and a 5-minute cool-down walk. The running block is short enough to hold a conversation through. That conversation is the real test of pace this early; the number on a watch tells you very little in week 1.
The plan runs 9 weeks and builds gradually: by week 4, all three sessions include two 5-minute running blocks alongside two 3-minute ones, and week 5 closes with a first unbroken 20-minute run. Skipping ahead of that progression is a common way people get hurt or burn out before it clicks. The run-walk method works because the walking segments aren't a consolation prize; they're what makes the running segments possible at all in week 1.
Weight, joints and shoes: what the evidence actually says
There's no weight or fitness threshold you need to hit before starting. NHS's own guidance for the plan is to speak to a GP first if you're worried about your health before beginning. See a doctor before or during any of this if you get chest pain, dizziness, or breathlessness that's out of proportion to what you're doing.
On joints specifically: a 2017 systematic review and meta-analysis in the Journal of Orthopaedic & Sports Physical Therapy (Alentorn-Geli et al.), pooling data across 17 studies and over 114,000 people, found recreational runners had a lower rate of hip and knee osteoarthritis than sedentary non-runners. The review linked higher rates to high-volume competitive running instead. Individual risk still varies, but this data runs against the common claim that running wrecks your knees.
On shoes: NHS's own advice for the plan is to wear running shoes that support your feet. A properly fitted pair from a running shop beats guessing, but you don't need to spend heavily to start week 1.
Common mistakes that stall beginners
- Running too fast. If you can't talk during the running intervals, you're going too hard. Week 1's running pace should feel almost too easy to count as exercise.
- Doing too much too soon. Jumping ahead to week 3 or 4 because week 1 felt easy is a common way to get injured. The plan's progression is gradual on purpose.
- Running every day. NHS Couch to 5K schedules a rest day between each of the three weekly sessions. Running daily without that recovery tends to end in shin splints or a stalled routine rather than faster progress.
- Judging week 1 against someone else's week 1. How far you should be able to run depends on weeks of consistent training. Age and how other people look while running don't set it.
Compare to yourself, not to others. In Runked, the rank starts everyone at Bronze and moves only on your own runs.
What to do after week 1
If week 1 felt manageable, week 2 of NHS Couch to 5K keeps the same structure with slightly longer running segments. If it felt hard, repeating week 1 before moving on is normal, not a setback. Either way, the next questions people usually have are about how often a beginner should run and what pace a beginner should actually run at.
Once you're running continuously for 20 to 30 minutes, a structured plan replaces the couch-to-5K schedule. Runked's 5K training plan takes over from there.
Find out where you stand
Runked is free on the App Store. Connect your watch or track 3 runs, and meet your Runk.
Download on App StoreFrequently asked questions
Can I start running if I'm overweight?
Yes. There's no weight or fitness threshold to start: NHS's own guidance for Couch to 5K is to speak to a GP first if you're worried about your health before beginning. A 2017 systematic review and meta-analysis in the Journal of Orthopaedic & Sports Physical Therapy (Alentorn-Geli et al.) found recreational runners had a lower rate of hip and knee osteoarthritis than sedentary non-runners. Start with the walk-run structure above rather than trying to run continuously from day one.
How slow is too slow?
There's no such thing, for these first sessions. NHS Couch to 5K's week 1 running intervals are meant to be a jog, slow enough that you could hold a conversation through them. If you can't talk during the running part, slow down further. In week 1, the interval structure matters more than the pace.
How many weeks before I can run 5 minutes straight?
On the NHS Couch to 5K plan, that happens in week 4. All three of that week's sessions have the same shape: a 3-minute run, a 90-second walk, a 5-minute run, a 2-minute 30-second walk, a 3-minute run, a 90-second walk, then a closing 5-minute run. Everyone moves through the 9 weeks at a slightly different pace, and repeating a week before moving on is normal.
Should I walk first?
If you're not currently active at all, yes. WHO and ACSM guidance asks adults for at least 150 minutes a week of moderate-intensity activity (WHO's 2020 guideline range is 150 to 300), and brisk walking counts toward that. Building a walking habit first, even just 20 to 30 minutes most days, makes the run-walk intervals in week 1 easier to start. Runked's free tier tracks those walks and runs the same way, toward a rank and streak that count a walk the same as a jog; PRO's training plans pick up once you're running continuously.