I wear my Sketcher Shape-Ups all the time. There's a cross country trail in a park the next town over from us and I wear them there. Up hill, down hill, flat areas, and there's a part of the trail called "The Bowl" (I give the cross country runners high marks for running UP this hill!!) and the rolling motion of the shoe really gives my legs and butt a great workout. I'm sort of a fitness fanatic myself and these fitness shoes have never bothered my feet, ankles, calves, shins, or knees. Plus the shoes are like walking on a pillow...