All of these events are big on fun, and in descending order of difficulty. WIPEOUTRUN is the easiest, all the way down to Spartan Race Sprint as the hardest "beginner-friendly" races. If you're looking for a good reason to get muddy and experience an actual mud run/obstacle course race with guys and gals, our best suggestion is to start with Warrior Dash. Yeah, we know you're the adventurous type - but recommend getting at least one OCR under your belt before you move up to Spartan Race Sprint; even the short distance is pretty darn difficult with mandatory obstacle completion (the only one on this list that requires it)!