Thursday Run to/from Work

First run to work for a couple of weeks. Was a bit if a struggle. Tried not to push the pace at all and when I do that i seem to struggle more. 14km
The run home was my tempo run for the week. The aim was to tack on another 4km at the end for 18km. Tried to push the pace from the start but the legs were not firing. I was stuffed by the time a got home and way down on my expected time. Picked up scribble and made the final 4km a jog instead of continuing the tempo.