Getting older sucks......... Yeah, I know, I'm whinin......
One of the things I've noticed about myself over time is that it takes me a lot longer to get warmed up when I want to go for a ride. As far as I can tell, it generally takes me approximately 45 minutes to get warmed up and get my ticker moving at the right speed. From that point on, I'm usually pretty OK, but it definitely takes some time to get there.
To back up that idea, almost every MTN ride I've done out at Herbs was timed by my riding partners. Without fail, the second lap has always been faster than the first.
Maybe if I ever get to race seriously again, I'll have to consider that fact in my preparation.