The Idea:

By the mid-2010s, Christian Toetzke had already done what most founders dream of. He'd spent years creating marathons, triathlons and cycling races around the world, sold his company Upsolut Sports to French media giant Lagardère, and moved to the corporate side, running every event they acquired.

But he was an entrepreneur at heart. And one thing kept bugging him. Around 200 million people walked into gyms every day, yet no competition was built around what they actually did there. Runners had marathons. Triathletes had Ironman. Gym-goers had a mirror.

As Toetzke saw it, working out was the only sport with no gamification. Nobody plays tennis just to burn calories.

So he quit. He began testing a race format with his friend Mintra Tilly, a trainer of elite athletes and military personnel, running trials on family and friends. Then he brought in Moritz Fürste, a German hockey star with three Olympic medals, including gold in Beijing and London.

In November 2017, the pair made it official. The format was simple: eight 1km runs and eight stations, identical in every city, so a time in Berlin means the same as a time in Dallas.

This was the beginning of HYROX.

The Execution:

• The early days: A court-ordered name change after a trademark dispute killed the brand's original name, "CuRox", before it had even taken off.
• 2018: The first race in Hamburg drew 600 competitors. Five events that year produced 2,711 finishers.
• 2019: HYROX grew to 12 events, including its first US race in Miami, and closed the year with 9,306 finishers. In December, Infront made its first investment in the business to fund the planned expansion.
• 2020: Near-death. An indoor mass-participation business hit a pandemic. US races in New Orleans, Cleveland, Boston and Long Beach were scrapped, and the World Championship shrank to a 12-athlete invite-only event. Just 3,793 people raced all year.
• 2021: HYROX rebounded to 16 events across four countries, including a first London race in September. London participation went on to jump nearly 3,000% in three years.
• October 2022: Infront took a majority stake, building on its 2019 investment.
• June 2024: PUMA signed a global deal as official apparel and footwear partner through 2027. By then, more than 175,000 people had raced across 65+ events in the 2023/24 season.
• January 2025: 650,000 people had signed up across 85 events that season. London alone received 70,000 applications, so HYROX had to introduce a ballot.
• September 8, 2026: A consortium led by L Catterton, with Jeffrey Katzenberg's WndrCo, bought out Infront in a deal that sources said valued HYROX at about €600M before completion. The founders didn't cash out. They reportedly went from a combined 40% to 51% ownership and borrowed to do it.
• Today: HYROX ran 100+ events for 1.4M participants and 1.5M spectators in 2025/26, and expects to pass 2M athletes in 2026/27. World Triathlon has adopted the format, and the Olympics is the next target.

The lesson?