I floated this morning and I don't know why

I floated this morning on my 3 mile run and I don't exactly know why. Couldn't have been the 3 McDoubles I had last night. I think some of it was the fact that I didn't carry my handheld waterbottle and I had my Brooks Ghost 3 shoes on instead of my Mizuno's. The Brooks are lighter, cushionier (prnounced: cushion-ee-er) and springier (pronounced springy-er). However, on runs longer than 4 or 5 miles I need more protection. In all of my years of running I have only had one setback with my "bad" knee. My "bad" knee is the one that I blew out playing basketball when I was 31. I had the ACL and MCL repaired. My scar is huge and turns an interesting shade of pink in the summer. My training calls for a day off tomorrow. I am going to the Y. I haven't been there in a while. Saturday I will take a 5 to 6 mile walk with my wife. On Sunday morning I will run 13.1 miles. Since this heat has been so crazy, I have been thinking about heading out at about 5:00AM. I sat through a 401K meeting at work yesterday and realized (not the first time I have realized this!) how fleeting our lives are. . .even though I am a christian, it is very sobering to think about how short our stay here on earth is and just how long eternity is. . .