Nuclear Fit vs XLETIX Challenge : distance, stations, prix et difficulté comparés (2026-27)

Nuclear Fit is an outdoor hybrid fitness race run by Nuclear Races at its obstacle course site near Brentwood, Essex. Instead of an indoor track, athletes run six 1 km trail loops, each including two 4 ft hurdles, and complete a fitness station after each loop in a central arena called The Core.

The stations use farm-themed equipment: a tyre flip, a farmers urn hug, a plough pull, a milk churn carry, a sandbag duck-and-throw and a squat-and-lift, with separate loads for men and women. Categories include singles, doubles and mixed doubles, plus a three-person relay in which each member completes two runs and two stations, and a Pro wave with longer station distances. Waves start every 10 minutes, chip timing records each run and station split, and there is a 2-hour time limit. It suits runners and gym-goers who want a hybrid race on trails rather than indoors.

The XLETIX Challenge (presented by MaxiNutrition) is a team-focused obstacle race series organised by XLETIX GmbH, a Berlin company founded in 2013 by Jannis Bandorski and Matthias Ernst. Events take place at seven locations in Germany and Austria, including Berlin, Tirol Innsbruck, München Erding, NRW, Norddeutschland and, from 2027, the Nürburgring.

Participants choose one of three distances, 6 km, 12 km or 18 km, with up to 35 obstacles involving mud, water, walls and slides. The course is run in 6 km loops, so team members can pick different distances and anyone can stop after a completed loop. The focus is on getting through the course together rather than on finishing times. The series suits groups of friends, colleagues and first-time obstacle racers as well as fitter runners who want the longest distance. The same company also runs XLETIX Kids for children aged 5 to 15 and the women-only Muddy Angel Run.