So I just completed c25k & started today with the 10k. I was able to run for a total of 40 minutes at a speed of 5 mph & up to 6mph for a couple min. I was running outdoors & now have been running on a treadmill, which I find pushes me more with speed & builds my endurance. It definitely kicked my butt today but I'm glad I did it. I want to eventually be able to run a half marathon. That would be amazing. I'm excited!