Thought this might stimulate some conversation here. I joined a very active gym in my town and began attending as many work out classes as I can. Initially, it was spinning, but gradually I have added weight lifting and Zumba type classes. With time, I had no choice than to start working on abdominal strength by doing core work in addition to the heavy cardio that seems to knock off big chunks of weight but maybe contribute to loss of muscle mass. The gym is convenient, you get in and out and get real results in weeks and even more results as the months pass.
Training road rides have been less frequent for me this year and I haven't bothered to journal my road rides like I normally do. My road miles are around only around 4 or 500 miles but my average speeds are exceeding my averages on years when I have ridden 10x as much. Getting a jump start on the fitness has made my time on the bike more exciting and opened my eyes about some of the defeatist mentality I was using when dealing (or avoiding) the hillier courses.
Last winter my weight was as high as 268, presently I'm well under 210 ( ~208 today in gym clothes). I expect to drop under 200 within a month, the first time this tired 49 year old has been at that level in over 15 years !