Hyrox-Style Swimming Races Are Surging in Europe — Is the US Next?

As hybrid racing grows, organizers are finding new places to make people sweat. Right now, the phenomenon is mostly limited to France and surrounding countries, although it could make its way to the U.S.

In June, 60 pairs raced at the Olympic Aquatics Centre in Saint-Denis, France, swapping Hyrox’s running legs for pool laps.

They had company.

Throwdown, a new registration, scoring and chip-timing platform for functional fitness competitions and hybrid races, counted at least 25 swimming-pool hybrid races in France between January 2025 and September 2026, across more than 20 venues. The format has since paddled into Belgium and the Netherlands.

It’s a spinoff of a race that’s hard to ignore. Hyrox, the uber-popular fitness-racing event that alternates running laps with exercises such as rowing or pushing a sled, expects more than 2 million people to race this season. 

With numbers like that, the format is bound to evolve. At a time when a workout doubles as a social life, and signing up for an event gives you a reason to train, everyday spaces are getting a second act. 

In France, it’s the local pool. Several pools are already in their second or third edition, according to Throwdown, and gyms such as CrossFit Grands Lacs in Biscarrosse have partnered with pools to stage their own races.

The usual setup includes eight fitness stations on the deck, from the rower and SkiErg to wall balls and burpees, with a 100-meter swim between each. Most races are run in pairs, and several offer beginner and advanced levels.

Beyond that, every pool sets its own rules, Throwdown notes on its site. Swims run from 25 to 200 meters, and totals from 200 to 2,000 meters. Teams go off three or four at a time, with a new wave every five to seven minutes, so the number of lanes decides how many pairs an evening can hold.

The oldest French edition Throwdown found was in Périgueux in January 2025. A handful more followed that year, then a rush of debuts in 2026, and Étampes, Brioude and Chabris now offer it as a weekly class.

The organizers consist of council-run pools, private operators such as Récréa and UCPA, clubs, associations and gyms that partner with a pool. What you pay depends on who runs it, from nothing at all to 110 euros per pair, according to Throwdown. Saint-Denis, which hosts its next edition Nov. 28-29, has charged 65 to 110 euros.

“The idea was to give organizers one tool for registration, heats, judging, live leaderboards and timing,” co-founder Léo Nourrisson said of the startup. “We opened it to organizers in late 2025, and we are still a team of two.”

It’s early days, which means plenty is still taking shape, including who’s racing. Throwdown doesn’t have survey data on who the typical pool racer is, and Nourrisson is reluctant to assume. 

“I would rather not guess,” he said.

In his view, the biggest risk is getting into the pool at all. “They are public facilities with busy schedules, and the format depends on operators being willing to host it,” he said.

Could the U.S. be next? It has already dipped a toe in, with California hosting its H2O Games since May. For now, though, the U.S. finds Throwdown, not the other way around.

“The U.S. is not our first market,” Nourrisson said. The startup already has an organizer in Miami running events on the platform, he added, “so the U.S. comes through organizers who find us.”

Kids Want In

Just as Throwdown sees an opportunity in the pool, the inflatables business sees one in play centers, as the boom gets younger interest. About 900 children signed up for Hyrox’s first kids’ race in the U.S., and at this year’s London kids’ race, more than a fifth of the kids had a parent in the same event.

Most kids, though, get their first taste at a play center, if not the pool. The Swim Rox at the Bains du Cotentin in Valognes, France, has included a youth division alongside adults, according to Throwdown.

Antony Sutton, group managing director of Airquee, one of Europe’s largest manufacturers of inflatable and leisure attractions, said the sudden interest comes from children watching their parents race. 

“Kids don’t just want to climb anymore; they want to race, and they want to know their time,” he said.

Hyrox’s Youngstars races are for children aged 8 to 15, but gyms can be inaccessible, he added. 

“Many gyms won’t let children on the gym floor until their teens, so your local soft play, trampoline park or inflatable park is the place to go,” Sutton said.