The Pennsylvania 600k starts on Saturday. Walking the dog this morning, my legs feel weak in anticipation. 600K, 375 miles, 40 hours. The numbers are too big. I did a 600k once before. But it was flat - it was not Pennsylvania. Think good thoughts. Breathe. Cool morning air. Put one foot in front of the other. The dog wags her tail and smiles. My legs feel weak. Perhaps I will ride to work - see if I still know how. Or maybe I should take the day off and rest up. I should have slept longer. The Pennsylvania 600k starts on Saturday.