"Harder than Ironman, Fairer than Ironman."

Andrew Fisher, First Isoman Champion. Click to read review

"Martyn Brunt of 220 takes on the Isoman..."

Click to read more

The Newton Marathon Run

26.2 Miles (42.1 km)

The Newton Half Marathon Run

13.1 Miles (21.1 km)

The Newton Quarter Marathon Run

6.55 Miles (10.5 km)

2017 Entries Now Open: Enter Here


The Isoman Newton Run

1st July 2017 - Arrow Valley Park, UK (B98 0LJ)

Isoman Newton Run

Take on the Isoman Marathon.

26.2 traffic free miles around the beautiful Arrow Valley Park

Medal, Goody bag, T-Shirt and Party! And the chance to be part of this spectacular day of endurance!

Sign up here for the Isoman Marathon

All abilities welcome!

Not quite ready for the full marathon yet? No problem - we have something for everyone with the half and quarter distances.

One of our guiding principles with setting up Isoman was to make it inclusive, not only to elites, but to beginners alike and create a single day of endurance where individuals from the swimming, cycling, running and triathlon community can all come together and enjoy the sports we love.

Sign up here for the 13.1 mile Isoman Half Marathon

Sign up here for the 6.55 Isoman Quarter Marathon

Fancy a face off with your swimming or cycling buddies?

By taking the world records for the marathon, 10km swim and the UCI hour cycling record and applying a tiredness formula (Read More...), we have equalised the distances across the sports so that level of excellence required to acheive the same time is similar so for the first time ever, you can compete against swimmers and cyclists to find out who is the best athlete. This gives you the opportinity to challenge your swimming or cycling buddies to a race to see who's the best athlete, All events will take place on the same day - nowhere else will you get the chance for such a face off.

Most equal of Triathlon Relays?

Or better still get together with 2 of your friends and do the relay. Nowhere else will you find a race where the legs are more equal!

Sign up here for the Relay.


The course involves 1, 2 or 4 laps of mostly flat, traffic free Arrow Valley Park with nutrition and water stations accessible on every lap.

Chip timing will be available with valuable split time intervals for each lap!

Party In the Park

Make sure you pack your dancing shoes. We'll have music all day with live music at the main stage in the expo field from 2pm onwards to welcome the athletes competing in the Isoman home.
Come and enjoy a beer or two and party the afternoon away! It is saturday afterall so no work in the morning!
There will be bouncy castles and other activities for the kids to take part in, so bring them along too! Whether you're taking part, watching loved ones or simply want to come and see what it's all about, you're all welcome.

Line Up

Completely Covered

The Mighty BACCHUS

Stuart Woolfenden

Music Like Lemons

dB Smith - Bluesman

Bloodwise - Our official Charity Partner

The party is being held in aid of Blood Cancers, and everyone is welcome. So come along, enjoy the show, drop a bit of your loose change in the buckets provided/buy raffle tickets and feel good that you're helping such a great charity. Isoman profits from the expo field will all be going to the charity. And if you're taking part in one of the challenges, then don't forget you can also raise money that way too. When registering, please leave the "Agree To Our Charity Partner Contacting you" checked and Bloodwise, formerly Leukaemia and Lymphoma Research will send you through a sponsorship pack.