As I have mentioned, I know that trail running extends my endurance.  A slower 6 mile in the hills is way easier than pounding out 6 miles at my top pace on pavement.  So…I decided to test my legs out and really see if my endurance on the streets was improving.  I decided to run a straight 10 miles.  I had never done this before, so it was a big deal for me.  It was hard,  but I’m very glad I did it.

10.3 miles @ 10:34 min/mile

I followed it up a few days later with a evening pavement run – experienced my first ever side ache, but clocked my best 5k time ever.. 3.5 miles @ 9:11 min/mile.  So, maybe my speed endurance was improving.