Around 2013, Judy Nyaruai Muhoro was sitting at her desk at Safaricom in Nairobi when a colleague walked over and said five words she has never forgotten.

"You're fat.

Let's go run."

At the time Nyaruai weighed 88 kilograms. Her youngest child was a year old. The gym wasn't working. She said yes anyway.

That first Saturday run with the Safaricom club covered 15 kilometres through Kitusuru — a detail nobody mentioned beforehand. At some point Nyaruai tried to flag down the ambulance. It drove past. She looked for a matatu. There wasn't one. She followed the route markings and made it back.

The colleague told the whole office on Monday.

Nyaruai came back the next Saturday.

By 2015 she was running weekday lunchtime 4Ks, Saturday long runs, and looking for more. A friend, Muthoni Njuguna, paid her entry and took her to her first Swaras trail run — a cold, rainy morning in May at Kefri, Muguga just outside Nairobi.

Trail queen Loise Mbarire blew a whistle at 7 am to flag off the run, and the crowd disappeared.

A runner named Davis stayed back, explained the arrow system, and jogged the first kilometre with her so she wouldn't get lost. When Nyaruai crossed the finish line after her 10kms run , Davis had already completed 30 kilometres and was having breakfast. He looked up and clapped.

"Very well done", he said encouragingly.

That was enough. Saturday mornings became sacred.

Stanchart 2017 was her first full marathon attempt. She reached kilometre 17, found an ambulance bed inside a support tent, and slept for forty minutes.

Her friends who had committed to support her were furious. She shrugged them off.

"I'll find a new hobby. It's not that serious" she told herself

A week later she signed up for the Kilimanjaro Marathon.

She trained four times a week in Kiambu with Benjamin, a semi-elite who marks Swaras routes. He told her plainly that her current pace was one he could walk for four days without getting tired.

She finished Kilimanjaro dead last. An ambulance and a police car followed her from kilometre 2. At kilometre 15, one officer in full uniform — leather shoes, leather belt — fell in beside her and ran 20 kilometres without complaint before peeling off at kilometre 35.

The stadium was already shutting down when she arrived. She got her medal. There was no official finish time.

That finish line wasn't a consolation. It was a data point.

In 2019 Nyaruai set a different kind of target. She could not run sub-3 hours. She decided to run every Abbott World Marathon Major instead.

She entered London through the ballot. She paid her own way to Berlin, Chicago, and New York — completing three of them in 35 days, flying back to Nairobi between each race to work.

"I had a file with notes telling me my next destination. Otherwise I would have shown up at the airport at the wrong time."

Her best time came at Chicago: 5 hours 51 minutes.

In 2023 she completed Tokyo then Boston a month later. That earned her a Six Star finish — the maximum the Abbott system awards, held by a small fraction of the world's marathon runners. She became the 11th Kenyan to earn the six star finish.

Slow runners can run the majors. It still counts.

Nyaruai Muhoro does not talk about running and business as separate things. For her, they are the same discipline expressed in different rooms.

By day she runs Infinity Tech Africa, content service provider licensed by the Communications Authority of Kenya — supplying corporate messaging and USSD services to businesses in partnership with Safaricom, Airtel and Telkom. The company has expanded into Tanzania and Ghana, and grown to include software development, payment gateways, and a stock management system. She is also a retailer in the fuel sector

The parallels are not subtle.

"When you're at kilometre 25 with 17 to go and you cannot quit — because you're in Europe and everyone is following you — that grit transfers," she says. "When a client says no, you find another angle. You plan your resources carefully. You wait and you stay alert."

She starts her runs at 4 a.m. to protect the working day. The discipline required to be on the road before sunrise is the same required to hold a business steady when contracts dry up. She has learned to read both kinds of terrain.

"Bloom where you're planted," she says. "This is the space where God placed me."

At a Backyard Ultra in Muguga — where runners complete a 6.7-kilometre loop every hour until only one remains — Nyaruai noticed something while watching from the sidelines.

Runners with personal support lasted longer. Runners without it dropped off earlier.

She went home, filled a thermos with hot porridge, and came back the following year. She boiled water through the night, started an Adopt a Runner system, and matched volunteers to individual athletes so nobody ran the dark hours alone. More people made it to morning. She then volunteered to support the race and eventually became race director.

That same instinct is behind the Vienna Loop Marathon — a 42-kilometre race on a 3.5-kilometre loop in Karen. The concept, which she calls One for One, directs entry fees toward funding a place for a runner who cannot afford to compete.

Last year she redirected her own race travel budget to send a talented runner named Reuben to compete in Turkey.

The woman who once needed someone to stay with her on the course is now the one making sure nobody runs it alone.

The people who built Nyaruai’s running life:

Nyaruai did not finish Comrades in 2025. She has a slot for 2026 and is in training.

She is also watching for the formal expansion of the Abbott Majors. Sydney, Shanghai, and Cape Town are expected to be added. When that happens, she plans to run all three in one year — in her usual style, she adds: not chasing time, not chasing podiums.

Just finishing.

She started because someone walked to a desk and said three blunt words.

The same logic runs the business, directs the races, funds the runners, and gets her out the door at 4 a.m.

"Slow runners are valid," she says. "Because we are valid."