Tough Guy Challenge tests endurance

A competitor emerges from an underground tunnel during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England. Every year thousands of people run the 8 mile assault course which involves freezing temperatures, fire and ice.

A competitor crawls through mud during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor emerges from the smoke during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor wades through muddy water during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

A competitor heaves himself out of a water obstacle during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor emerges from the tire crawl during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor climbs up an obstacle during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor emerges from the tire crawl during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor is taken away by medics during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

Two competitor heaves himself out of a water obstacle during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor poses before the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

A competitor dressed as "Bain" from the Batman films poses before the Tough Guy Challenge endurance race on Jan. 27, 2013,in Telford, England.

Competitors in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

Competitors in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

Competitors in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

Competitors in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor in action during the Tough Guy Challenge on Jan. 27, 2013, in Telford, England.

A competitor crawls under barbed wire during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

A competitor jumps into icy water during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

A competitor wades through water during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.

A competitor jumps into icy water during the Tough Guy Challenge endurance race on Jan. 27, 2013, in Telford, England.