Soldato
Try including some sprints, well not sprints but quicker periods with recoverys inbetween when you run distance. I do 10k on a Tuesday and include sprints of 3, 4 and 5 minutes with 4 minute recovery inbetween. It's helping with my speed.
I also find a HRM helps me judge my effort properly.
I also find a HRM helps me judge my effort properly.