How many days a week should you run as a beginner?

Running stresses your muscles, tendons and bones. They adapt and get stronger in the hours and days after a run, not during it. Rest days give them that time. The NHS says the rest days in its Couch to 5K plan help your body recover and reduce the risk of injury.

Three days is also enough to improve. The CDC recommends 75 minutes of vigorous activity a week, such as running, or 150 minutes of moderate activity such as brisk walking. Three 25-minute runs reach 75 minutes. Add a couple of walks and you have covered both.

Most of all, three days is a number most people can keep up. A plan you follow for six months does far more than an ambitious one you drop after three weeks. If three feels like too many right now, start with two and add the third when the routine feels settled.

The exact days do not matter. What matters is not stacking runs back to back while you are new. If you can only run at weekends, Saturday and Sunday plus one weekday run is fine. Just keep the Sunday run short and easy.

Your goal changes the number too. These are typical ranges for recreational runners once the first few months are behind them:

• Walk. A 20- to 30-minute walk helps recovery and adds to your weekly activity without much strain.
• Strength work. The CDC recommends muscle-strengthening activities on at least two days a week. Squats, lunges, calf raises, glute bridges and planks cover what runners need. A Newcastle Hospitals NHS leaflet for runners suggests strength and flexibility work two to three times a week.
• Low-impact cardio. Cycling, swimming or an elliptical give your heart and lungs work with less impact.
• Full rest. At least one day a week with nothing structured is reasonable, especially in the first months.

More on recovery in rest days and sleep for runners and stretches after running.

Add a fourth run when three feel comfortable and you have had no aches for a month or more. Make the new run short and easy, about half the length of your usual one. Keep your other runs the same for two or three weeks before you lengthen anything.

You will often hear the 10 percent rule: never increase your weekly distance by more than 10 percent. The Newcastle leaflet recommends it. The evidence is mixed. A 2008 trial of 532 novice runners compared a 13-week plan that followed the 10 percent rule with a standard 8-week plan, and injury rates were almost identical, about 21 percent in each group. Treat 10 percent as a sensible guide and listen to your body, rather than relying on the number alone.

• Soreness that lasts more than two or three days, or gets worse from run to run. See sore muscles after running.
• Pain in one spot, such as the shin, knee or foot, that is there at the start of a run. See shin splints and knee pain.
• Easy runs that feel harder than they did a few weeks ago.
• Poor sleep, low mood or a lingering lack of energy.
• Dreading runs you used to enjoy.
• A resting heart rate, taken first thing in the morning, that sits noticeably higher than usual for several days in a row.

None of these on its own proves you are overdoing it. A bad week at work can do the same. But if they line up with a jump in how much you have been running, the running is the likely cause.

If you notice two or more, take a few extra rest days or swap runs for walks. This is general information, not medical advice. See a doctor or physical therapist if pain lasts, gets worse, comes with swelling, or if you have a health condition.

Not in the first months. Your heart and lungs adapt faster than your tendons and bones, so you can feel ready for more before your legs are. Daily running is something experienced runners build up to over a long time, usually with most days very easy. If you want to move every day, walk on the days in between. Daily walking is safe for most people and counts toward your weekly activity.

If you love the idea of a daily streak, count any movement toward it. A 15-minute walk keeps the streak alive on the days your legs need rest.

A challenge with a time window works well with three runs a week. On X Challenge, Odin is 10 km over 10 days. At three sessions a week that is about 2.5 km per session. Thor is 21 km over 20 days, about 2.3 km per session. The app counts walks too, so your rest-day walks add to the total. For staying consistent, see how to build a running habit.

• Is running twice a week enough? It is a good start and better than nothing. Progress is slower than with three days.
• Is it bad to run two days in a row? Not for experienced runners. Beginners should keep a gap until running feels routine.
• How long should each run be? For beginners, 20 to 30 minutes including walking breaks. See how to start running.
• Should rest days be complete rest? Not necessarily. A walk or gentle cycling is fine and often helps.
• What if I miss a run? Skip it and carry on with the next one. Squeezing two runs into back-to-back days to catch up undoes the point of the rest day.

• Adult Activity: An Overview, CDC: 150 minutes of moderate or 75 minutes of vigorous activity a week, and strength work on at least two days.
• Couch to 5K running plan, NHS: three runs a week, with rest days that help recovery and reduce injury risk.
• No effect of a graded training program on the number of running-related injuries in novice runners, Buist and others, American Journal of Sports Medicine, 2008: no difference in injury rates between a 10 percent rule plan and a standard plan.
• Injury prevention advice for runners, Newcastle Hospitals NHS Foundation Trust: the 10 percent guideline and strength work two to three times a week.