What To Do

I am in somewhat of a quandary. I am supposed to be training to run my second half marathon but for some reason I just cannot get myself to do the runs. I guess I am having some kind of mental block. I don't think I have actually run in two weeks. Part of me thinks I should just forget it, that it is getting to late in the game. On the other side, I don't like being a quitter. I don't know what to do. I know my SIL is doing a great job with her training and I am even afraid that I am getting really far behind her. I guess I will just have to see what this week brings.