I've got a 16 mile RT = 80 mile/week and yes, I lost weight. In fact, I'm losing again since I got my new bike and am riding harder now. I dropped my gym membership a year ago b/c it wasn't necessary. But, I do pushups of several sorts to keep arms toned, core strength exercises and go to yoga a minimum of 2x per week. But I'm not skinny, just muscular and fit and feel great.