I have found it harder to break any barriers in running than in any other sport I do. I chalk it up to the fact my body just doesn't like it. So, whatever I do, I am now happy with. Hey, I still sweat if I run 2.5 miles or 4 miles, no matter how slowly I run.
I ran one 5K race and I would prefer never to have that experience again, despite the fact I have run 5K distance many many times when I am just out there. My time of 34 minutes wasn't even that bad for a 95 degree day and just having come back from my tour in Spain 4 days earlier. I hated the race so much, I told my friend, who was running the event, at the finish line, "I hate you."
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport