Metrix vs Tough Mudder: distance, stations, price & difficulty compared (2026-27)

METRIX is a fitness competition for pairs that combines a workout with nightclub-style production: DJ sets, lighting and a social recovery area with ice baths and saunas. It was co-founded by Toby Spooner and Will McLaren, launched in 2025, and has held events in London, Manchester and Cardiff.

Pairs move through five stations: SkiErg, burpees, rowing erg, bike erg, and sleds with shuttles. They share the workload however they like. Event listings describe each station as a ten-minute block. Scoring is done by technology rather than judges, with live tracking of every metre and rep, and a prize pool for the top teams. METRIX uses simple movements and is aimed at everyday athletes and first-timers, while still giving fitter pairs a competitive target.

Tough Mudder is an obstacle course event series founded in 2010 by Will Dean and Guy Livingstone, with its first event in Pennsylvania, USA. It has been owned by Spartan Race since 2020. Events are held mainly in the United States and Canada, with regional editions in the UK and other countries.

The main formats are Tough Mudder 5K, with 12 or more obstacles, and Tough Mudder 15K, with 20 or more obstacles over a 15 km course. Infinity events and the World's Toughest Mudder are 8, 12 and 24-hour endurance challenges. Signature obstacles include Arctic Enema, Mudderhorn and Electroshock Therapy. Tough Mudder is built around teamwork rather than finishing times, and most participants sign up as a team. The 5K suits newcomers and groups, while the 15K and endurance formats call for solid running fitness and upper-body strength.