Next month I turn 41. I started running about two and a half years ago, and I just (finally) got a road bike so I can go cycling again. I'm in fairly good shape, could run 8k right now if I wanted to, but here is where I'm confused. Last night I was sitting in front of the stage in my church with my band going over our set list for tonight's New Years service. I went to get up and then climb the steps of the stage and thought, "why is this so difficult?" It wasn't so much that it was painful - sort of but different - just difficult for lack of a better term. Anyone else relate? Or am I just a whiner?