Without an impossible challenge to rise to, man would have never have walked on the moon, decoded the human genome, or alphabetized the color wheel. Test your inner Ajax with today's Groupon: for $84, you get entrance for one to Tough Mudder's New England event at Mount Snow in West Dover, Vermont, on Sunday, May 8 (a $150.75 value). Groupon customers must register by May 1.

The challenging 10-mile Tough Mudder obstacle course was designed by British Special Forces to test all-around strength, endurance, mental determination, and camaraderie, with all sponsorship proceeds benefitting the Wounded Warriors Project. Over the course of an estimated 2.5 hours, rugged participants weave their way through a diverse terrain that boasts 21 demanding obstacles, including muddy trenches, water obstacles, high walls, slippery slopes, live wires, and a gauntlet of fire. Tough Mudder challenges the fittest of fit athletes, demanding mental toughness to match physical prowess, but emphasizes the course as a personal challenge, and not a race. Times are not kept, and it's about conquering the course rather than besting fellow Mudderers. Hardened course finishers enjoy a postcontest party with live music and a 48-hour glow of invincibility.