forward, backward

I ran 4.6K around my neighborhood on Thursday, just as the sun was setting, and felt good as I began but that feeling deteriorated by the end. I ran the same route this morning but in reverse and my feelings were backwards too -- that is, it took a lot to begin -- it took me four hours to convince myself to put my shoes on -- but I was fine by the end, and could've kept going. Tomorrow, I plan on a long run but I haven't determined how far yet, whether more than last week's 15K or less. I guess I'll wing it like I have been this entire "training" for the half (next week!).