I guess I wouldn't lose much weight if I just coasted around. If you think pedaling a bike isn't exercise, I'm not sure what to tell you. Because it is.
I don't run anymore because of neck surgery, bad back, bad knees, bad ankles, you get the idea. Swimming in my modestly-sized pool, and biking are really the only exercise I get.
I wish I could run as much and often and as strenuous as I once did, but getting older sure is putting a damper on that. For me.
This is why fat people don't go to the gym, because they think someone will say they are doing something wrong. Way to poopoo on someone who has an interest in cycling for fitness.