Hey there

Start slow and your endurance will build with time. What works for me is listening to audio books while I run (or podcasts- whatever is interesting.) Hard to stop when you're dying to hear just one more chapter.

If it starts to hurt more than reasonable muscle soreness, take it down a few notches. Injuries slow down training! A good stretch beforehand helps, of course.

I never liked running and now run 3-5 miles every other morning. Running outside has always been easier to me but once I started watching Netflix while running on the treadmill I prefer the treadmill. I download a couple episodes on my ipod and prop it up on the treadmill and you'll be amazed at how quickly the time flies! Especially if you are super into the show. Right now I am watching Dexter. It has been awesome because the episodes are 45-50 mins long so I allow myself a walk warm up and then don't allow myself to stop running until the episode is over. It's also 8 seasons long so I have been doing this for a month.

Good Luck!!