Hello! This is my first post. I'm not a cyclist by choice, but I'm starting to get into it. I'm a marathon runner who has had multiple serious running injuries since September. The only thing I can do is bike. I bike like a wild man. I mean 3-4 hours per day, everyday, no matter what. Since I live in IN. I can't get outside when the roads are bad because of stupid drivers. I can handle cold, but traffic and time limits me. I have to start at about 3;30 a.m. to get a good workout. I"m a school teacher and coach during the day. I've also been lifting weights. My goal is to get into tremendous shape. With that said, I can only ride on a trainer. I have enough fortitude to ride that for 2 hours straight. I'm doing interval workouts on it. I get tired and sweaty even though I ride in a sub freezing garage. I want to know how many calories I'm burning and how much of a benefit this is. Also, if any one knows of some killer trainer workouts let me know. I'd love to challenge myself even more.