I'm 6'1" and 46 years old. 20 years ago, I weighed 175. The answer would be obvious, except that a typical day for me involves between 60 and 120 minutes of cycling and/or an hour of swimming. About 20-30 miles on my bike and about a mile in the pool. Generally, if I know I'm going to the pool, I might only bike 20 miles that day. But if I'm not swimming that day, I will take the long route to and from work. I bike about 18-20 mph and swim about a 2 minute per 100 yards pace. I've been doing this for a few years now. Based on the number of calories I've burned, I should weigh about 90 pounds. I don't eat very well, but I'm no fast food junkie either. I don't drink beer either. Anyone else have this problem where they exercise A LOT for A LONG TIME and still don't lose weight?