London Marathon 2025: Runner’s Lessons from a Record Race

The London Marathon 2025 was held on Sunday 27 April 2025 and became the biggest marathon in history, with 56,640 people crossing the finish line on The Mall. Run under warm, sunny skies rather than the usual cool April drizzle, the 45th edition rewarded runners who had trained patiently, fuelled carefully and paced themselves honestly. This guide looks back at what the race was actually like and draws out the practical lessons — in training, gear, nutrition and race-day execution — that helped runners finish strong, so you can apply them to your next big-city marathon.

What made the 2025 London Marathon different?

The headline fact of the 2025 edition was its size: 56,640 finishers set a Guinness World Record for the largest marathon ever, overtaking the 55,646 who finished the 2024 New York City Marathon. For context on the effort involved, every one of those runners covered the full 42.195 km marathon distance, from world-class professionals to first-time charity runners.

At the front, Kenya’s Sabastian Sawe won the men’s race in 2:02:27, while Ethiopia’s Tigst Assefa took the women’s title in 2:15:50, a women-only world record. In the wheelchair races, Switzerland’s Marcel Hug (1:25:25) claimed a seventh London win and Catherine Debrunner (1:34:18) a third. If you want the complete placings and times, see the full 2025 London Marathon results rather than the lessons covered here.

The other defining feature was the weather. Late April in London is usually mild and often damp, but race day 2025 was dry and sunny, starting around 11°C and climbing toward 22–23°C through the afternoon. Organisers issued warm-weather advice, and runners who adjusted their pacing and hydration for the heat generally fared better than those who stuck rigidly to a cool-weather plan.

Beyond the elite results, the event is defined by its mass-participation scale. The vast majority of those 56,640 finishers were club runners, charity fundraisers and first-timers, and London is consistently one of the world’s largest annual one-day fundraising events. For many runners the goal was never a fast time at all, but simply to finish and raise money for a cause — a reminder that the lessons below apply just as much to a six-hour finisher as to someone chasing a personal best.

What is the London Marathon 2025 course like?

The course followed the traditional point-to-point layout from the Blackheath and Greenwich start areas in south-east London to the finish on The Mall, beside Buckingham Palace. It is one of the flatter major marathon routes, which is a large part of why it attracts runners chasing fast times, but “flat” does not mean featureless.

Where are the hills and landmarks?

Most of the route is gently rolling, with the sharpest short climbs coming late — around Tower Hill and again on the rise toward Birdcage Walk before the finish. Along the way runners passed the Cutty Sark in Greenwich, crossed Tower Bridge near halfway, looped through the skyscrapers of Canary Wharf and the Isle of Dogs, then ran the Embankment past Big Ben toward St James’s Park and The Mall.

Where was the crowd support strongest?

Spectator noise peaked at Tower Bridge, along the Embankment and in the final stretch to the finish. The quieter stretches tended to be parts of Docklands and the Isle of Dogs, where runners often had to rely on their own rhythm and mental cues rather than crowd energy. A practical note from 2025: tall buildings around Canary Wharf can scramble GPS, so split times from a watch may briefly look faster or slower than reality in that section.

How was the start organised?

Because the field is so large, the marathon uses several colour-coded start areas on Blackheath and around Greenwich Park, with runners set off in waves through the morning. The separate routes merge within the first few miles before the course settles into one road to the finish. Knowing which start you were assigned to — and getting there with time to spare — was one of the simplest ways runners avoided a stressful morning, because missing a wave meant starting further back and weaving through slower traffic for miles.

How did runners train for the race?

Most finishers built toward the 2025 race on a 12 to 16-week plan, running three to five times per week. The key was consistency rather than heroic single sessions, and the structure scaled with experience.

What did a typical training week look like?

• First-timers usually ran three focused sessions a week: one long run, one easy recovery run and one faster session such as a tempo run or intervals.
• Intermediate and advanced runners added structured work — marathon-pace efforts, hill repeats and strides — on top of a higher weekly volume.
• Long runs gradually extended toward 30–35 km in the peak weeks, which is where runners rehearsed fuelling and the mental side of late-race fatigue.

Why did strength and cross-training matter?

Runners who included strength work and one weekly cross-training session — commonly cycling or swimming — tended to arrive healthier. Those who skipped strength training more often ran into stability problems and repetitive-stress niggles such as IT band pain or Achilles soreness. Cross-training was especially useful during recovery weeks and when managing a minor injury without losing fitness.

What were the best nutrition and hydration strategies?

Fuelling was a clear divider between a comfortable finish and a difficult one, and it mattered even more because of the warm 2025 conditions. The runners who struggled least had practised their race-day nutrition for weeks beforehand.

How much should you fuel during a marathon?

A common and well-tolerated target was 30 to 60 grams of carbohydrate per hour, taken through gels, chews or sports drink and rehearsed on long runs so the stomach was used to it. Before the start, many runners ate 200 to 300 grams of carbohydrate two to three hours out, sticking to familiar foods and avoiding any last-minute experiments.

What was the on-course drinks setup in 2025?

The official support was generous but worth knowing in advance. Bottled Buxton water was handed out roughly every two miles, Lucozade Sport drinks were offered in cups at Miles 9, 15, 21 and 24, and Lucozade Sport gels were available around Miles 14 and 19. Runners who knew this layout could carry less of their own fluid and plan exactly where to top up — and in the heat, taking small, regular sips worked better than gulping at a single station.

What gear worked best on race day?

The clearest gear lesson from 2025 was simple: nothing new on race day. Runners who raced in shoes, socks, belts and clothing they had already tested in training avoided the blisters, chafing and surprises that derailed others.

• Shoes: carbon-plated racing shoes were everywhere, but their benefit was greatest for runners who had actually trained in them. Comfort and fit mattered more than any specific model, and shoes with roughly 100–200 km of wear felt broken in without being worn out.
• Clothing: technical, moisture-wicking fabrics plus anti-chafing balm made the warm, sunny day far more bearable. A cap and sunscreen were sensible additions that many wished they had packed.
• Watches: a GPS running watch helped most runners hold pace, with the Canary Wharf signal wobble the main thing to expect rather than fear.

A small kit list that paid off on the day: a lightweight throwaway layer for the cool start that could be discarded once warm, a tried-and-tested running belt or vest for gels, blister plasters applied before the race rather than after, and a plan for where family or supporters would stand. None of this was exotic, but the runners who had thought it through spent race morning calm rather than scrambling.

How did runners pace the 2025 race and chase a PB?

Even pacing was the single biggest factor in a strong finish. Going out just five seconds per kilometre too fast was enough to leave many runners fading badly after 30 km, where the race is really decided.

How do you set a realistic target pace?

Runners who set targets from recent race results — using tools such as a marathon pace chart or calculators like McMillan and Jack Daniels — were far more likely to hit their goal than those who guessed. Breaking the distance into blocks (for example 10 km + 10 km + 10 km plus a final push) made the task feel manageable, and checking splits at the mile markers allowed small mid-race corrections before a bad patch became a wall.

Does tapering really help?

Yes. Reducing weekly mileage by about 40 to 60 percent over the final two weeks left runners fresher without losing fitness. The mistake to avoid was overhauling diet or gear during the taper; the two weeks before a marathon are for rest and routine, not reinvention. For first-timers especially, there is no shame in starting conservatively and running the second half faster than the first.

What were the most common mistakes in 2025?

Many of the hardest finishes traced back to a small number of avoidable errors, and nearly all of them were planning mistakes rather than fitness problems.

• Starting too fast: excitement and a flat early course tempted runners into banking time, which almost always cost more later.
• New shoes or kit on the day: blisters and chafing were overwhelmingly caused by gear worn for the first time.
• Under-fuelling early: waiting until Mile 20 to take on carbohydrate was too late; the runners who fuelled from early on held their pace.
• Ignoring the heat: sticking to a cool-weather pace plan on a 22°C day led to cramping and over-heating after 30 km.
• Skipping long-run practice: those who had never rehearsed the final 10–12 km in training were the most likely to hit the wall.

How did the strongest runners handle mindset and motivation?

Mental preparation was as important as physical readiness, and it was built in training rather than summoned on the day. Over a 12 to 16-week block, motivation naturally dipped, so runners used small weekly goals, training groups and apps such as Strava, TrainingPeaks and Garmin Connect to stay accountable and see their progress.

On the course itself, simple psychological tools made a measurable difference. Many runners leaned on mental mantras or a couple of cues written on a hand or bib — reminders about pacing, fuelling or why they were running — to get through the tough middle miles and the final climb to The Mall. Breaking the race into landmarks, from Tower Bridge to Big Ben to Birdcage Walk, turned an overwhelming 42 km into a series of achievable steps.

What about race-day logistics and recovery?

Smooth race mornings came from arriving early and keeping everything familiar. Runners who reached their start zone at least 90 minutes before their wave had time for bag drop, toilet queues and a proper warm-up without stress.

What helped recovery afterwards?

Recovery started the moment runners crossed the line. Rehydrating steadily, eating a mix of carbohydrate and protein within an hour or two, and gentle walking or stretching the next day all helped reduce stiffness. Both net (chip) and gun times were recorded, and runners could check their splits within hours through the official event app — useful data for planning the next race.

How can New Zealand runners use these lessons?

For Kiwis, the London Marathon 2025 is both an inspiration and a template. The same principles — patient training, tested gear, honest pacing and rehearsed fuelling — apply equally to a home race such as the Auckland Marathon, which makes an ideal goal event to practise everything before travelling abroad.

If London itself is the dream, it pays to plan early: entry is mainly through a ballot, and the logistics of flights, accommodation and time zones need months of lead time. Many New Zealand runners budget and save well ahead for an overseas marathon trip, and you can learn more about NZ agencies that help with that side of the planning. For the entry process, ballot and evergreen course detail, our full guide on how to enter the London Marathon covers the steps in depth.

Frequently Asked Questions (FAQ)

When was the London Marathon 2025 held?

The London Marathon 2025 took place on Sunday 27 April 2025. It was the 45th edition of the event and started from the Blackheath and Greenwich area in south-east London, finishing on The Mall near Buckingham Palace.

How many people finished the 2025 London Marathon?

A record 56,640 runners finished the 2025 race, which set a Guinness World Record for the largest marathon ever. That figure surpassed the previous record of 55,646 finishers at the 2024 New York City Marathon.

Who won the London Marathon 2025?

Sabastian Sawe of Kenya won the men’s race in 2:02:27 and Tigst Assefa of Ethiopia won the women’s race in 2:15:50, a women-only world record. In the wheelchair races, Marcel Hug won in 1:25:25 and Catherine Debrunner in 1:34:18.

What was the weather like for the 2025 race?

It was unusually warm and sunny for late April. Temperatures started at around 11°C and rose toward 22–23°C during the afternoon, prompting warm-weather advice from organisers. Runners who adjusted their pacing and drank steadily coped best with the heat.

Is the London Marathon course flat?

The course is one of the flatter major marathons, which helps it produce fast times, but it is not completely flat. The main short climbs come late in the race around Tower Hill and on the rise toward Birdcage Walk, so even pacing and some strength work in training both help.