I finally, finally, completed the first run of week 4 after about 8 or 9 failed attempts. The last five minutes kept on defeating me. But this morning I did it. I don't know whether it was the cold, the sunshine or a slightly changed route but whatever I DID IT.
Fingalo thanks for your encouragment, I couldn't remember your poem but I did remember a book I used to read to my daughter about trains pulling trucks up a hill and the engine (perhaps it was Gordon or Thomas the Tank) repeating to itself "I think I can, I think I can, and then when it was nearly at the top changing to "I know I can, I know I can" so I used that to keep me going.