I used to be afraid to jump up on the step with one riser. I couldn't do it 2 footed (is that a word?). I am ok with this now, and recently, I've been thinking about trying 2 risers, not just for jumps, which we don't always do, but for the tabata routines and other intervals we use the step for. I can handle the forward facing ones, but there are a few turning steps I worry about, that I might trip and kill myself. Once, when we were using the steps for some resistance work, or something that wasn't hard, our instructor (who is the age of my older son), said everyone had to use 2 risers. When I got a look of fear in my face, someone said, "you can do it," and I heard her (the instructor) say, "of course she can, I don't know why she doesn't." Over time, I have become one of the few who only uses one riser. The others have to do a much more modified routine than me, especially in terms of their cardio capacity. I think one of the things that scares me, is how short my legs are. It makes some of the steps a lot more challenging. I have the steps truly ingrained in my muscle memory,f rom teaching, but still...