I first started C25K a few months ago outdoors but I could never fully complete every interval on week 1. I gave up, and 2 weeks ago I joined a gym. Last week I started with Week 1 again. The first time I had to cut short a couple of running intervals. I thought I'd be running week 1 all the time and would never progress. I did week 1 four times, and the third time I managed to run every interval. I was dreading moving on to week 2. After completing the first run today (with only having to cut 5 seconds off a running interval because of a stitch) I finally believe I may be able to do a 5k in 8 weeks!
I'm mostly doing this to get fitter and lose some weight so I really hope there is someone out there who lost some weight doing this.