As a casual runner, I would also add: do not run for pace or distance, only run for effort.
If you're working hard (not over-exerting) and breaking a sweat, you're doing it right. If you feel like you're over-exerting, walk for a bit. The most common newbie running plan (couch-to-5k) starts off with mostly walking for the first few weeks.
I've never been into running but I took up the "couch to 5k" programme and it's been really good.
I'm now at the point of running for 25 minutes three times a week and enjoying it. I do need to listen to music as I run though (and the C25K app).
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