My story is like the ones above -- when I first started out again, it was painful.

I had a similar experience today -- I screwed around all day and didn't got in a bike ride, so about twilight I got my dog on a leash and started out on a walk. I decided to give running a try, so I started jogging along. I didn't get very far at all until I was in serious pain. I had to stop and think about why I felt so terrible -- I thought I was fit, after all. Seems that if were to start running, it would be just as bad as starting out biking again. Am mulling this over now. May have to start mixing in some runs into my weekly routine.