FLATOUT London 2026

Why This One's Blowing Up

FLATOUT launched in 2026 as an unofficial answer to Hyrox mania in London, and press coverage has leaned straight into that — one outlet called it the city's "latest unofficial spin-off" of the Hyrox obsession. What sets it apart: the running sections are outdoors along the Thames, not on an indoor exhibition-hall loop, and every workout zone is run by a different local London gym rather than a single global operator.

The Format

4 km of total running, broken into 8 x 500 m runs, each followed by a functional workout zone: SkiErg, Goblet Squats, BikeErg, burpees, RowErg, Farmers Carry, lunges, and Ground-to-Overheads. Six ways to enter: Solo, Elite (weighted vest, cash prizes), Doubles, Relay (team of 4), NextGen (ages 8–15), and Sidekicks (one adult + one junior).

Venue

Old Billingsgate Market, on the Thames near Tower Bridge — one of London's most scenic race backdrops, with the finish-line photo taken against the Tower Bridge skyline.

Date

25–27 September 2026, racing across three days with different formats assigned to different days (Solo: Sat/Sun; Elite: Sat only; Doubles: Fri–Sun; Relay: Fri/Sun).

What's Included

No booking fees, a free event t-shirt, free spectator entry for supporters, a free professional race photo, a finisher medal, and a FLATOUT patch.

Who It's For

Athletes who already train 2–3 times a week and want a benchmark race day without the cost or scarcity of major indoor Hyrox events — plus a genuinely accessible entry point for families via NextGen and Sidekicks.