I completed it last year on the treadmill. Then tried running a 5K distance around a lake and failed miserably. Much different running on a treadmill vs running outdoors. Took me about an additional 2 weeks to be able to run it outdoors. I like the program a lot as it got a fat butt like me to be able to run even though I still don't really like running. I just run because it's very effective for me in the weight loss department.
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