You might think running downhill would be the easy part of trail running. You'd be half right. Easier for your heart & lungs, but harder on everything else. And there's always the risk of twisted ankles and trail rash. Two weeks ago I was running downhill on Dakota Ridge, tripped on a rock and instantly hit the ground. My right hand and shoulder bore the brunt of the fall. As painful as the initial scrapes were, scrubbing the dirt out was even worse.