Can I run a 5K if I start running at 45?

Yes. Plenty of people run their first 5K in their 40s, 50s and beyond. Give yourself a few months of run/walk training, and expect it to take a little longer than it might have at 25.

Is running bad for your knees as you get older?

For most healthy people, running at a gentle, gradual pace isn’t bad for the knees and can help keep them strong. If you already have knee pain or a past knee injury, check with a doctor or physiotherapist before you start.

How long will it take me to get fit?

Most people notice runs feel easier within a few weeks. Running 20 to 30 minutes without stopping usually takes a few months, and it’s fine if yours takes longer.

Should I start with walking instead of running?

If you haven’t exercised for a long time, yes. Two to four weeks of brisk 30-minute walks, three times a week, is a great way to prepare your legs before you add short running intervals.

Starting running after 40: a gentle guide that works

Yes, you can start running after 40, and after 50, 60 and beyond. Start with short run/walk intervals at an easy pace, run two or three times a week with a rest day between runs, and add a little strength work for your legs. The main difference from starting younger is that recovery takes a bit longer, so progress more slowly and treat rest days as part of the plan. Check with your doctor first if you have a heart condition, high blood pressure, or any health worries.

Is it too late to start running at 40, 50 or 60?

No. People start running at every age, and many of them stick with it for decades. You may not be as quick as you were at 20, but you’re not competing with your 20-year-old self. You’re building something new: fitness, a habit, an hour a few times a week that’s just for you.

There are some real advantages to starting later, too. You’re probably more patient than you were, more likely to listen to your body, and less tempted to sprint off and blow up after 200 meters.

What changes when you start running later in life?

Mainly, your body takes longer to recover and adapt. Your heart and lungs will improve quickly, but your muscles, tendons and joints need more time to get used to running. A few things to expect:

You’ll feel stiffer after runs, especially the next morning. That’s normal and it eases as you get used to it.
You’ll need more rest between runs than a younger beginner.
Calves and Achilles tendons (the cord at the back of your ankle) can be a weak spot, so ease in gently.
Warm-ups matter more. Jumping straight into running feels harder at 50 than at 25.

None of these are reasons not to run. They’re reasons to run a bit more cleverly.

How should you start running after 40?

Start with walking and very short running intervals, and only move on when the current step feels easy. A simple path:

If you’ve been inactive for a while, walk first. Brisk 30-minute walks, three times a week, for two to four weeks.
Add short runs. Try running 30 seconds to 1 minute, then walking 2 minutes, repeated six to eight times.
Warm up and cool down with 5 minutes of walking every time.
Run slowly enough to talk in full sentences. If you can’t, slow down or walk.
Stretch the running bits gradually, a little at a time, over weeks and months.
Repeat any week that felt hard. This is normal, not a setback.

Our guide to the run-walk method explains how to pick and progress your intervals.

The Run app builds this caution in. It picks your starting level from what you can do today, and if you’re 50 or older or have had an injury before, it starts you one level lower. After each run you rate how tiring it was, and a very tiring run makes the next one lighter straight away. You can read more on how it works.

How much rest do you need between runs?

At least one full day between runs, and two if your legs still feel heavy. Two runs a week is a perfectly good start; three when two feel comfortable. Here’s an easy week:

Day	What to do
Monday	Run/walk session, 25–30 minutes
Tuesday	Rest or a gentle walk
Wednesday	10 minutes of strength exercises
Thursday	Run/walk session
Friday	Rest
Saturday	Run/walk session, or rest if you’re tired
Sunday	A long walk, a bike ride or nothing

Sleep counts as training too. Our guide to rest days for runners explains why the days off matter so much.

Should you do strength training as well?

Yes, a little. Stronger legs and hips cope much better with running. You don’t need a gym. Ten minutes twice a week is enough:

Squats to a chair: sit down and stand up slowly, 10 times.
Calf raises: rise onto your toes and lower slowly, 15 times. Hold a wall for balance.
Step-ups: step up onto a low stair and down again, 10 times each leg.
Glute bridges: lie on your back, knees bent, lift your hips, 10 times.
A plank: hold for 20 to 30 seconds.

Do two rounds. Keep it easy at first and add more over the weeks.

How do you avoid injuries when starting running after 40?

Go slowly, rest well and take aches seriously. The basics:

Change one thing at a time: longer running bits or an extra run, not both in the same week.
Keep almost all of your running easy.
Choose softer, flatter routes at first: park paths, tracks or a treadmill.
Wear comfortable, supportive shoes. Our guide to running shoes for beginners helps you choose.
Know the difference between soreness and pain. General muscle soreness for a day or two is normal. Pain that is sharp, gets worse as you run, makes you limp, or lasts more than a few days is a reason to stop and see a doctor or physiotherapist.

If your knees grumble, our guide to knee pain for beginner runners has some gentle first steps.

Should you see a doctor before you start running?

It’s a good idea if you’ve been inactive for a long time, or if you have a heart condition, high blood pressure, diabetes, joint problems or any other health condition. The same goes if you’ve ever had chest pain, dizziness or fainting during exercise. Most doctors are delighted to hear you want to start running, and they can tell you if there’s anything to watch out for.

Then lace up, start slowly and enjoy it. Starting at 40, 50 or 60 just means you have years of running ahead of you.