Endurance riding seems to make upper body muscle mass disappear. I'm in the gym 4 times a week working upper body, but I can't maintain upper body muscle mass when riding a lot... it just vanishes along with strength. Lifting heavy gets harder and harder with the more I ride. If I stop riding for a week or two I can begin to put mass back on with the same workouts, but once I start riding hard again, while maintaining upper body workouts, the upper body muscle disappears. Gaining weight seems to be nearly impossible when riding a lot and maintaining weight (not losing) can even become difficult. Any ideas? Success stories?