Careful dude it can become very addictive, I got it bad once, chasing personal bests, running every other day, entering stupid races.. Heart rate monitors, special shoes, wimmen, sex after the run..
Don’t do it, go to a fish shop, buy a cold wet cod and hit yourself in the face with it instead.
You’ll be sorry if you don’t, it’s worse than buying a road bike and becoming effeminate.