Started out my ride today with a pretty intense headache, a stomach that didn't feel real great and an overall blah feeling. I figured I would ride for an hour and see how I felt, if things didn't get better would head home and take it easy. First 20 minutes were a lttle nasty but then the sinuses opened up and cleared out and everything came together, rode 50 miles and had my second fastest averg MPH of the season. It just goes to show you never know how you will feel on a ride. I've also had the opposite where I felt pumped, couldn't wait to get out and then the whole ride felt like I was pedaling in wet concrete.
Have you had this experience before?