So... did my second run yesterday, now it is officially a commitment.
It was treadmill again, not because of the weather this time, but when I thought about it, I'd rather have my first week in controlled environment and use the opportunity to get some extra confidence. My first run went very smoothly, managed to finish it without any pains or aches. I was listening to my body, trying to remain in slow but steady motion.
So for my second run I thought to slightly increase my running interval speed by 0.5 mph (up to 5.5). And what do you know, it was much harder this time so much so I could barely finish it. My knee started hurting, and generally it did not feel that great this time. It might be that kind of a day, food I ate or something else completely. Hate that treadmill, but it helped me understand my run better. Also it helps reduce the impact on my knee which is major concern for doing it in the park.
That would be huge step for me on another level as well, as being chubby for last 15 years or so made me self-conscious in a bad way; and I definitely don't want to look awkward mixed with other runners. But reading stories of people like me gave me that extra bit of confidence, so thanks all for that. Next week I hope I'll be ready, both physically and mentally, to take the fight outside. Wish me luck.