I disagree.. it's a whole heckuva lot harder on my body to ride my bike 13 miles to work than to drive my car or ride the bus there. For me it IS exercise, and that's one of the reasons I like it. The other is to keep my sanity by avoiding sitting in stopped or slow moving rush hour traffic in my car. Even walking around my neighborhood. Walking up a hill is a lot easier (if slower) than pedaling up hill.