I have been noticing that it takes me a good bit of time to get into a groove/warmed up while riding. I was MTB riding yesterday and just pissing myself off because I was quickly out of breath, legs fatigued quickly, and I had no confidence for the technical stuff(thats what the MTB riders call riding over boulders, logs, rocks, etc.). This wasn't my first ride of the season so I was a bit frustrated with my poor perfromance in the beginning. After about an hour I finally got into a groove and was flying over the techinical stuff and back to my old self. I find this occurring sometimes on road rides as well. The first five to ten miles seem to be a chore and then all of the sudden click, I am into a groove. I am sure my age and condition have something to do with it but I have been riding this season but don't feel like I did at the end of last season. I wasn't completely inactive in the winter, rode at the gym, ran on the treadmill. Any one else go through something like this? Maybe since this is only my second season riding this is what the off season does to you?