Deadly Dozen Cambridge

Deadly Dozen lands at One Leisure, St Ives

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Deadly Dozen Mori Logo

Deadly Dozen is coming to Cambridge.

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Deadly Dozen arrives at One Leisure, St Ives Outdoor and Gym on 22 August 2026, bringing the UK's original fitness race to Cambridgeshire for one unforgettable day of strength, speed and grit.

The challenge is simple to understand and brutally hard to master: 12 × 400m runs, each followed by one of 12 demanding exercise stations — the Labours. From the first lap to the final rep, the clock keeps running.

Take it on Solo, race side by side in Pairs, or share the work in a four-person Relay. However you enter, the same start line and all twelve Labours are waiting.

Race it your way

Pairs and Relays can be Same-Sex or Mixed (Mixed Relay: 2x Male + 2x Female). Mixed Pairs use the Male weights; Mixed Relays use the weights specific to their sex.

Solo

1 Athlete

Just you against all twelve. The purest test of grit — set your time, chase the ranking, earn the finish.

ENTER SOLO

Pairs

2 Athletes

Tackle it shoulder to shoulder. Run all 12 Laps together and split the Labours however you like - beat the race as a team.

ENTER PAIRS

Relay

4 Athletes

Race as a team of four. Complete 1 Lap and 1 Labour, then tag in the next team member; each team member completes 3 Laps and 3 Labours.

ENTER A TEAM

Simple. Brutal. Addictive.

Woman with hair in a bun holds a weight plate outdoors, looking focused and slightly tired during the Deadly Dozen Cambridge workout.

At its core, Deadly Dozen is deliberately simple.

  • 12 × 400m Runs

  • 12 Labours (Exercise Stations)

Twenty-four stations. One continuous race.

No technical obstacles. No gimmicks.

Just honest work repeated under fatigue.

Every athlete races the same format, creating a fair, competitive experience that’s easy to understand—but incredibly difficult to master.

Two men running on a track in a stadium with empty spectator seats in the background. One man is shirtless with tattoos, wearing shorts, and the other is wearing a black top and shorts. The image is in black and white.
Black and white photo of a shirtless older man with gray hair, looking down with a serious expression.
A woman lifting a dumbbell over her head during outdoor workout, other woman bending forward in the background, trees and cloudy sky in the distance.
A woman with long hair running outdoors during daytime, wearing a sports bra, running shorts, and a smartwatch.
A group of runners racing on an outdoor track, with a smiling female runner in the foreground making peace signs, others behind her, and flags with sponsor logos on the side.
A woman wearing sunglasses and athletic clothing is lifting dumbbells overhead during an outdoor fitness event. There are other people and flags in the background.

A race designed by athletes for everyone

Every competitor receives the full experience.

✔ Mori Medal for every finisher

✔ Free professional race photos

✔ Free race transfers

✔ Official Mori Patch

✔ Global leaderboards tracking your performance

✔ Race certificate

Mori mascot medal

The Deadly Dozen breakdown

  • Man running

    START: 400m Run

    1 lap of the track

  • Farmers carry

    Farmers Carry

    Farmers Carry
    240m - KB Carry
    Male 2 x 24kg/53lbs
    Female 2 x 16kg/35lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Image of Deadlift

    Deadlift

    60 Reps - KB Deadlift
    Male 1 x 32kg/70lbs
    Female 1 x 24kg/53lbs

  • 400m run

    400m Run

    1 lap of the track

  • Lunge

    Lunge

    60m - DB Lunge
    Male 2 x 12.5kg/30lbs
    Female 2 x 7.5kg/20lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • DB Snatch

    Snatch

    60 Reps - DB Snatch
    Male 1 x 15kg/35lbs
    Female 1 x 9kg/20lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Man jumping outdoors with tattoos and shorts, exercise scene

    Burpee Broad Jump

    60m Bodyweight

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Goblet Squat

    Goblet Squat

    60 Reps - KB Squat
    Male 1 x 16kg/35lbs
    Female 1 x 12kg/26lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Front Carry

    Front Carry

    240m - WP Front Carry
    Male 1 x 25kg/55lbs
    Female 1 x 20kg/45lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Push Press

    Push Press

    60 Reps - DB Push Press
    Male 2 x 12.5kg/30lbs
    Female 2 x 6kg/15lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Bear Crawl

    Bear Crawl

    120m (Bodyweight)

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Overhead Carry

    Overhead Carry

    180m
    Male 1 x 15kg/35lbs
    Female 1 x 10kg/25lbs

  • Deadly Dozen Track Race

    400m Run

    1 lap of the track

  • Clean & Press

    Clean & Press

    60 Reps - WP Clean & Press
    Male 1 x 15kg/35lbs
    Female 1 x 10kg/25lbs

  • Female athlete at Deadly Dozen Fitness Race

    400m Run

    1 lap of the track

  • Regenerate alt text copyIconcrossIconBlue Woman in a sports bra lifting dumbbells outdoors, smiling as she trains for a Fitness Race with flags and trees in the background.

    Devil Press

    20 Reps - Dumbells
    Male 2 X 10 kg/22lbs
    Female 2 X 5kg/11lbs

Your place is
waiting.

Cambridge · 22 August 2026

One start line. Twelve obstacles. Sign up in a single click.

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