I had been running about 4-5 miles a day since I was in high school (I'm 23) and I am still not at the weight that I want to be. I just started riding 2 weeks ago, and I have already lost 5 pounds!! I can ride a whole lot longer than I can run, thus burning a lot more calories. I have always eaten very healthy, so now I am so happy that something is actually working!! I LOVE riding!!!