<p>A participant takes part in a trial run of the new tear gas obstacle for Tough Mudder in Vale Lake, near Temecula, Calif., Nov. 1, 2014.</p>
January 24, 2015
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January 24, 2015 8 p.m.
Tough Mudder to add tear gas obstacle to its 2015 events
LONDON - For many, just the thought of running 12 miles over mounds of mud and through pools of ice water is enough to make them cry.