Mega Mud Run Challenge, Charleston

Clean freaks aren’t welcome at the Mega Mud Run Challenge. The 5K race is full of obstacles that grow increasingly sloppy as stampedes of booted runners stir up chunks of turf. In addition to posing standard race challenges to endurance and speed, the rugged trail forces racers to crawl under nets through marsh grass, walk tightropes suspended over tidal creek mud, and scale a 17-foot knotted rope without the use of a hovercraft.

Racers can compete as individuals or in teams of four. For foursomes, two members must fireman's-carry their other teammates for the final 100-yard stretch, so they should prepare by practicing their carrying form and refraining from eating lead for breakfast. After the race, guests can unwind with beer and food—cash only—as an awards ceremony honors the top finishers.