I've been a runner for many years but I needed to find something with less impact to my chronically sprained ankle. I don't like exercising indoors and normal bicycling just doesn't get my heart rate up (or my excitement level). All the outdoor elliptical bicycles I tried are large, expensive contraptions. Then I found the Halfbike 3. A Halfbike Ambassador in Chicago let me try his and I was hooked. What a fun workout! I'm even learning to do some tight turns. I've always been a thrill seeker (skydiving, motorcycling, etc.) so I appreciate the exhilaration. Now that I'm comfortable on it, I find that it can be a relaxing, leisurely ride as well.