You sit at a desk all day, you haven’t run since school, and you’ve decided to be ready for a 5K by spring. The way to start running without getting hurt is to begin with walk-run intervals, run three times a week with rest days between, and treat pain as a signal to stop rather than something to push through. This guide uses the NHS Couch to 5K plan and its injury advice, plus one randomised trial that challenges a popular rule.
This is general fitness information, not medical advice. The NHS says that if you’re worried about your health before starting a running plan, you should see a GP first. Stop and get advice if you feel pain that doesn’t ease.
How to start running without getting hurt: the first nine weeks
The NHS Couch to 5K is free, and the NHS says you can complete it in 9 weeks or longer, depending on what works for you. It has you running three times a week with rest days in between, and by the end you’ll be running for 30 minutes without stopping. The NHS also says there is no pressure to keep up with anyone else, so the pace is yours.
Week 1 on the NHS running plan shows how gentle the start is. Each of the three runs begins with a 5 minute walk, then alternates 1 minute of running with 1 minute 30 seconds of walking seven times, finishes with a final 1 minute run, and ends with a 5 minute cool-down walk.
Example: the arithmetic is 5 + (7 x 2.5) + 1 + 5 = 28.5 minutes, which matches the plan’s stated total of 28 minutes 30 seconds. Only 8 of those minutes are running. The rest is walking, which is what lets your tendons and bones adapt before the load goes up.
| Stage | What the NHS plan has you do | What to watch |
|---|---|---|
| Week 1 | 1 minute runs with 1 minute 30 seconds walks, three times in the week | Feeling slightly too easy is the right level |
| Week 5 | More running than walking; the third run is your first 20-minute run | The first big jump in continuous running |
| Week 9 | All three runs are 30 minutes | The plan itself says it’s not about speed |
If a week feels too hard, repeat it. Because the NHS says the plan can take 9 weeks or longer, repeating a week is part of the design, not a failure.
Run slowly enough to talk
Most beginners start too fast. The CDC’s page on measuring physical activity intensity gives a rule of thumb: at moderate intensity you can talk but not sing, and at vigorous intensity you can’t say more than a few words without pausing for breath. For your running days, aim for a pace at which you could hold a short conversation. If you’re gasping after 90 seconds, you’re going too fast.
The intervals are also a pacing tool. Walk breaks are not a sign that you’re doing it wrong. They give your heart rate and your legs time to recover.
Shoes, warm-up and cool-down
Shoes
The NHS injury page says it is important to buy the correct running shoes and that it’s best to go to a running shop to be fitted. Wear them in for a few walks before the first run, and replace them when they look worn. Do not buy by price alone: a fitted mid-priced pair is a better choice than an expensive pair that doesn’t suit your feet.
Warm-up
The NHS warm-up routine should take at least 6 minutes. It starts with about 3 minutes of marching on the spot, then heel digs, knee lifts, shoulder rolls and a few small knee bends. The Couch to 5K plan already builds in a 5 minute walk, so on plan days you can add a minute of knee lifts and heel digs at the door.
Cool-down
End each run with the 5 minute walk the plan prescribes. After that, the NHS stretching routine says to hold each stretch for 15 to 20 seconds, with a full routine taking about five minutes.
A run you can repeat on Thursday beats a run you’ll regret by Wednesday.
What the research says about “never add more than 10% a week”
You’ll often see advice to increase weekly running by no more than 10%. A randomised trial in The American Journal of Sports Medicine (2008) tested a graded programme built on it. It followed 532 novice runners preparing for a recreational 4-mile (6.7 km) event. One group followed a 13-week graded programme based on the 10% rule, and the other a standard 8-week programme. Injuries occurred in 20.8% of the graded group and 20.3% of the standard group, so the trial found no effect of the graded programme.
That doesn’t mean progression doesn’t matter. The study found that a graded 13-week programme built on that rule did not reduce injuries compared with a standard 8-week programme. The NHS injury advice is more specific and easier to follow: do not increase the intensity or distance of your running too quickly, and do a similar run at least 3 or 4 times before you increase your pace or distance. Changing only one variable at a time is a simple way to apply this.
Common running injuries and what the NHS says to do
The NHS knee pain and other running injuries page lists five of the most common running injuries: knee pain, Achilles pain, shin pain, heel pain and muscle strains. It says running injuries can affect anyone. The advice below is taken from that page.
| Where it hurts | What the NHS says |
|---|---|
| Knee | Do not run if you have knee pain. See a GP straight away if the pain is severe or the knee is swollen; otherwise, stop running and get it checked if the pain does not go away after a week |
| Shin | Shin pain is likely to stop you running for a while. See a GP or physiotherapist if the area is swollen, the pain is severe, or it doesn’t improve in a few weeks |
| Heel | Can happen if you suddenly start doing a lot more running. Stop running and see a GP straight away if there’s a lot of swelling in the heel or under the foot |
| Muscle strain | Stop running immediately |
The page also warns that runners often notice a dull ache in the shin but carry on running. That is the pattern to break. A niggle that is still there at the start of the next run is a reason to take an extra rest day or to repeat the previous week.
Common mistakes in the first weeks
The most common is running too fast on week-one runs, which makes walk breaks feel like failure and makes the third run of the week miserable.
The second is running on consecutive days because the first session felt good. The plan has rest days for a reason, and the NHS says it is three runs a week with rest days in between.
The third is changing everything at once: new shoes, a new route, a longer run and a faster pace in the same week. Change one at a time.
The fourth is ignoring a pain that changes how you run. If you notice yourself limping or shortening your stride to avoid discomfort, stop and rest.
The fifth is skipping the strength side. The NHS guidelines advise strengthening activities for all the major muscle groups on at least 2 days a week, and the NHS lists running among its aerobic examples, so a running plan doesn’t cover that on its own. Two short sessions of squats, glute bridges and calf raises a week fit around a running plan without extra equipment.
A weekly schedule to copy
- Monday: Couch to 5K run 1 (warm-up walk, intervals, cool-down walk).
- Tuesday: rest, or a 20-minute easy walk.
- Wednesday: Couch to 5K run 2.
- Thursday: rest, or a short strength session.
- Friday: Couch to 5K run 3.
- Saturday and Sunday: rest, walking, stretching.
If life interrupts and you miss a week, repeat the last week you completed rather than jumping back in where you left off.
Your pre-run checklist
- Shoes fitted at a running shop and worn in on walks
- A route you know, ideally flat and well lit, away from busy road crossings
- A warm-up of at least 6 minutes
- A pace you can talk at, with walk breaks used as planned
- A rest day before and after each run
- The same run repeated 3 or 4 times before you raise pace or distance
- Any pain noted and acted on using the NHS guidance above
- A 5 minute cool-down walk and a short stretch
The takeaway
To start running without getting hurt, follow a walk-run plan such as the NHS Couch to 5K, run three times a week, and keep the pace conversational. Get fitted for shoes, warm up for at least six minutes, change one thing at a time, and take knee, shin or heel pain seriously using the NHS thresholds above. Repeating a week is allowed.
