My body is confused

I am a frequent reader of Steve Tilford's blog. I know I am out of shape, but I feel envious, especially today, when he laments about feeling off and then riding himself into feeling good. I had the opposite happen this morning, and now here at work, I feel worse. I started off pretty well. It was cool out this morning, if just below 60 is cool. It is for Phoenix. I was warming up reasonably well, and holding a decent cadence in the small ring, even uphill. Got out to the first hill on my weekday route that gets me around 25 miles total, and then things went downhill from there. I know I am struggling from lack of fitness and being grossly overweight. My body is confused. It seems to love being out and riding, but is tearing itself up in the process. So now I sit here writing, about 4 hours post ride, and I am a bit tired, and some muscle aches. I also wish that I rode myself into feeling better, but with the wind, and not enough endurance, that is not going to happen. Oh well, I now able to focus solely on riding, and getting back into shape. I have a very long road ahead of me. No big deal, one focus and all that.