I used to do this all the time for about 8 steps in my parents house. Once, though, I went forward a bit too far and my head hit the drywall ceiling, causing my back to fall onto the wooden steps and me to slide downward to the bottom. I'm glad the edges of the steps were beveled and not sharp-cornered. I have a tendency to enter into tachycardia if I am under stress and if I move a certain way while beginning a breath. When it happens, the beating is faster than I can count by my wrist pulse, maybe 300 or more per minute. I must stop it immediately by slowly letting out a controlled breath a certain way. In worst cases, I had to lie on my back and then let out the breath slowly the certain way. It's been several years since it has acted up very much and by being careful, it has lessened as time has passed. It was the worst when I was a teenager when it once made me faint. When it would happen, if I didn't stop it, chest discomfort would begin and blacking out would be imminent.