My plan has been to begin speed training in January. My plan is to replace my Saturday long run with half an hour of speed. My Wednesday 2-hour run will thus become my long run. My goal during January and the first week of February is to run fartleks.
I ran a fartlek at the end of my run this morning. That fartlek is often called a "kick", and it is a nice way to end a run or race. For the last 150 or so feet, I increased my pace a bit. Not a big increase, but enough for the first time. I will do this kick after each run from now on.