Another thing it could be is just too much running! I've run basically every other day this month! I definitely don't want to do the Dirty Dash with lingering pain or injury. I want to have FUN! Too much training, too much use is NOT a good idea. Rest is GOOD!
I was finally able to watch the Midwest Finals of American Ninja Warrior! They had a Curtain slide thing instead of devil's steps/devil's staircase - but I still want to find a good place like in this video to practice them!