article_snippet: Despite the rather unpleasant obstacles, the events have become so popular that many of the events sell out weeks in advance.
article_snippet: However, participants generally finish the booby-trapped tracks in around three hours.
article_snippet: Swinging success: Despite the rather unpleasant obstacles, The next Tough Mudder events have become so popular that many of The next Tough Mudder events sell out weeks in advance .