I'm no runner, I was always terrible at it since childhood. Anything above 100 meters was too long and I couldn't breath through it properly, which was quite a thing at school. I'm ordinary sized person, no (serious) health problem, just lack stamina for running.
But lately I found running to be quite "fun". Or better world would be "relaxing". I still suck terribly at it, but as I'm older, long gone from high school, I don't care. I live right at the edge of town so literally hundred steps to the nature, so once I feel like I need to empty my head, I go running. While I slowly choo choo around I can turn the brain completely off and just relax. And feel like dying later because I still lack the stamina past first kilometre lol.