Last weekend I had a tough time keeping up with my group, and felt physically lousy. I got some tips about how to improve which I'm trying but I was still thinking of dropping to a slower group. Well today I rode with my same group & felt great ...perfect weather and an easier warm up helped. But in retrospect I realized I was "PMS-ing" the week before my lousy ride, which included eating poorly... Does anyone out there (esp in the 45 + age group) notice monthly changes in performance related to there cycle (menstrual that is!)?? I never even had any PMS symptoms til I passed 40!