This summer, for the first time, I have always felt really weak during XC rides. I used to train and race pro DH and while occasionally I felt tired during a ride, many many rides I felt great and was able to attack. 2 summers ago was my last year racing and now I ride to have fun. Other than some irregular winter gym time my summer routine is about the same. I usually ride XC 2-3 times a week. My rides are never shorter than 1 hr but not over 2 hours and range from 5-12 miles. I have replaced DH shuttles with moto and when I can't find the time to ride at all I jump on my pump track for a few minutes. I can not remember the last XC ride I did where I was fresh and had enough strength to attack. What gives?