Fire, ice, and rope climbs: inside the Tough Guy race

Thousands muscle up for eight-mile assault course: nearly one-third of starters will fail to finish
A competitor runs through water during the Tough Guy Challenge endurance race on Janv 29 in Telford, England (All images courtesy of Getty Images)
Every year thousands of people run the eight-mile assault course, which involves freezing temperatures, fire and ice
Competitorsare required to crawl through thick mud under yards of barbed wire, hurdle over walls of fire and plunge into a freezing lake
Around 6000 competitors take part in the challenge every year but up to a third never make it to the finishing line
The event, first held in 1986, was started by former Grenadier Guardsman Billy Wilson
The race claims to be the world's most demanding one-day survival ordeal
Each competitor is required to sign a 'death warrant', clearing the organisers of any legal responsibilities in the event of injury or death
The assault course features obstacles such as the \nKilling Fields, Battle of the Somme and the Vietcong Torture Chamber
Competitors must also make it past marshals that throw thunder flashes and smoke bombs over their heads
This year's race attracted runners from more than 20 countries
Many of the keenest competitors are said to be from the USA