Tempo run

Today's workout was as follows - 2 miles w.up jog- 4/5 miles tempo at a controlled HR <165bpm followed by a 2 mile w.down jog

I felt really good today and smooth, pace was around 5.50-5.40 per mile. 

My fitness is coming back slowly after months of easy runs, give me 4-6 weeks and this tempo run will be 5.20pace at the same heart rate ;)