For $95, today's side deal gets you one entry to Tough Mudder's Austin event (a $160.75 value). Groupon customers can register for Sunday, January 30 only. Space is limited, so you must register by January 19. Sponsorship proceeds from the event support the Wounded Warrior Project.

The challenging 10-mile Tough Mudder obstacle course was designed by British Special Forces to test all-around strength, endurance, mental determination, and camaraderie. Over the course of two and a half hours, participants will weave their way through a diverse terrain that boasts 19 demanding obstacles, including muddy trenches, underwater 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—only 80% of entrants reach the finish line. After the event, participants receive a free beer provided by Dos Equis.

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Tough Mudder was featured in the New York Times and on the CBS News. More than 65,000 Facebookers are fans of the business.