Super Challenging Races to Test Your Strength and Determination
By Erica SchuckiesUpdated OnJuly 28, 2015
So you've raced a 5K, 10K or even a marathon. You say you're bored with running one foot in front of the other from point A to point B. Looking for the next step to challenge your mental and physical vigor? We pulled together a list of challenging and unique obstacle/mud runs to put your athleticism to the test.