First 10K How to train for a 10K

What changes when you go from a 5K to a 10K

"Part of the reason why the 10K is an awesome event is asking you to have a good amount of speed and a good amount of endurance," says Chris Bennett, Nike's global head running coach, on the page for Nike Run Club's 10K plan. For a first 10K, the endurance comes first. "True speed always starts with endurance," he says elsewhere.

Here's what doubling the distance really means. At 12 minutes a mile, a 5K takes about 37 minutes, and a 10K takes about 1 hour and 15 minutes. You aren't just adding 3 miles. You're adding most of another half hour on your feet.

That asks three things of your training, and none of them is heroic.

A long run that grows. Once a week, usually Saturday, one run gets a little longer, from 2 or 3 miles up to about 6.

More easy miles. Your week grows from about 6 miles to somewhere between 10 and 14, nearly all of it at a pace you could talk at.

A little faster work. A few short, quick strides, a hill workout, a stretch at a steady, harder effort. Small doses.

Your heart and lungs catch on within a few weeks, so you'll feel ready for more sooner than you'd guess. Your tendons and bones take months, which is why the miles climb slowly even on days you feel great. And a 12-mile week asks more of your meals than a 6-mile week did.

How far your long run needs to go

In 1974, two years after running the 10,000 meters at the Olympics, Jeff Galloway agreed to teach a beginners' running class through Florida State University. "None had done any running for at least five years," he recalled. "So we started walking with a few one-minute jogs." He spent time with each group on their runs and changed how often they took walk breaks so nobody wore out. At the end of the course: "Everyone passed the final exam: finishing either a 5K or a 10K with smiles on their faces."

The idea holds for your first 10K. The long run is about time on your feet, not about never stopping. Walk when you need to. It still counts.

The long run is the heart of 10K training. Most first-10K plans start it at 2 or 3 miles and grow it by half a mile or a mile at a time, to a peak of about 5.5 to 6.5 miles a week or two before the race. Some plans take you a little past 6.2 in training. Others stop just short and let a lighter race week carry you the last stretch. Both get you there.

What matters most is the size of each step. Many running injuries start with one run that goes well past your longest run of the past month. If your longest run lately is 3 miles, don't jump to 6 because a friend asked you along. Add a little at a time, and take a lighter week every few weeks so your body can catch up.

Saturday is also your rehearsal. Wear the shoes you'll race in and try the socks and the shorts, so race morning holds no surprises.

Why most of your runs should feel easy (and a few a little faster)

In the late 1990s, an American exercise physiologist named Stephen Seiler had just moved to Norway when he watched an elite cross-country skier stop at the bottom of a hill and walk up it. "I said, well what the heck are you doing?" he told Alex Hutchinson of The Globe and Mail. She knew exactly what she was doing. Seiler spent the next 15 years studying how elite endurance athletes train, and the pattern kept showing up: most of their training is easy, and the hard days are truly hard.

The rest of us tend to drift. Researchers at Ball State University followed college distance runners through a 14-week season, asking the coaches how hard each day should be and the runners how hard it felt, on a scale of 1 to 10. On easy days, the coaches asked for 1.5 and the runners averaged 3.4. On hard days, the coaches asked for 8.2 and got 6.2. The runners let "most of the sessions drift into the middle," Hutchinson wrote. Seiler's name for the fix is "intensity discipline."

For a first 10K, that means nearly all your miles should be slow enough to hold a conversation. Easy running makes up most of a runner's week, and it's the base everything else rests on. If slow feels like cheating, it isn't. It's how the miles add up without wearing you down.

Then add a little speed. "Fast is scary," Bennett says. "But it should also be fun. It should add a little excitement to your routine." In a first-10K plan, fast comes in small pieces: a few short strides at the end of an easy run, a short hill workout, a stretch at a comfortably hard effort late in the plan. Short bursts of faster running can improve fitness and race times, on top of your easy running rather than in place of it. A short strength session once a week belongs in the mix too, because strength work does more to prevent injuries than stretching does.

What to eat when you train for a 10K

Shalane Flanagan won an Olympic medal in the 10,000 meters in Beijing in 2008 and set an American record in the race. Her eating took longer to figure out. "We grew up in a culture, at least in college back at Carolina, you know, that fat would make you fat," she told CBS News. "So we were eating everything low fat." Then: "And little did we know that we were just eating more sugar and processed foods." With her college teammate Elyse Kopecky, a chef, she switched to whole foods and healthy fats, and the two wrote the cookbook Run Fast. Eat Slow. The change, Flanagan said, "has really extended my career."

What you need is enough real food, every day, to cover the running. Eating enough to match your training is what lets the training work, and an underfed runner gets tired, not fitter.

Your food can rise and fall with the week. A 6-mile long run burns roughly 600 calories for a 150-pound runner, so eat more on long-run and harder days, and eat normally on rest days, not less. After runs, refill with carbs and add some protein. Runners need more of both than people who don't train, so spread protein across your meals, not just dinner.

Underfueling is easy to slip into. The International Olympic Committee's experts list everyday warning signs: feeling worn out, legs that never recover, sleeping badly, getting cranky, getting sick more often, and training that stops paying off. Low energy also weakens bone and raises the risk of stress injuries. The first fix: eat more on run days.

Hoping to lose a few pounds along the way? You can, with food as part of the plan. Running alone rarely does it, because more miles usually bring more hunger. The size of your calorie deficit is what drives fat loss, and going slowly, about half a percent to one percent of your weight a week, keeps more of your muscle and lowers the odds of getting sick or hurt. Take the deficit from the whole day, never the meals around runs.

How you’ll know it’s working

In 2025, a research team led by Rasmus Østergaard Nielsen at Aarhus University in Denmark published what 5,205 runners in 87 countries had recorded on their sports watches over 18 months: 588,071 runs in all. About a third of the runners got hurt along the way. The clearest warning sign was a single run that went well past the runner's longest run of the previous 30 days. "Our study marks a paradigm shift in understanding the causes of running-related overuse injuries," Nielsen said.

That's what a record is for. It shows your longest run of the past month at a glance, so the next Saturday can be a small step up from it, not a leap. It shows your progress, too. Around week 8, pull up an easy run from week 1 and compare. Same pace, lower heart rate? That's your fitness showing up, and an Apple Watch is accurate enough to show it.

A record also catches the quieter problems: a week where you ran more and ate less, or a pair of shoes slowly piling up miles. Those are easy to miss when your runs live in one app, your food in another, and your plan on the fridge.

Race day

Billy Mills, an Oglala Lakota runner who grew up on the Pine Ridge Reservation in South Dakota, went to the 1964 Tokyo Olympics with few people giving him a chance in the 10,000 meters. "I stayed with the pack," he told World Athletics. "I decided with 120 metres to go I'd make one final try to win." Coming into the last stretch, he thought, "I can win, I can win." He did, in an Olympic record, nearly 50 seconds faster than his previous best.

His race is a good model for yours: stay patient early, and save your effort for the end.

Before race day, the last week or so of your plan gets lighter on purpose, because running less before a race, while keeping a little speed, helps you race better. Keep eating normally through those lighter days. On the morning, start slower than you want to and settle in for the first few miles. If you have something left at mile 5, that's the time to use it.

Six miles looks like a long way the first time you picture it. A few weeks of patient Saturdays turn it into a distance you know.