November 1, 2013 I began a new lifestyle of eating clean and circuit training, which include some HIIT of walk/run intervals. In doing this, I discovered not only could I run (I was a smoker for years and didn't think my lungs could handle it), but I LOVED to run! I mean seriously, I did some running in my early 20's, but knew nothing about the importance of health. I decided to include jogging as my cardio several weeks ago, and I set a goal to run a local 5-miler next summer. I am SO blessed to have found the 10k app. I am totally addicted! I run at least five days/week. Earlier in the training, when the running was about 8 min., I did the same day twice! Now, the 25 min. seems to be a stretch, but so far so good! I am thankful for the posts, specifically the tips on breathing, because I was breathing from my mouth and chest! It's taking me a while to get used to breathing from the gut, but I'm getting there. THANK YOU, Zen Labs!!!