This one got a mild meme treatment - what's more relatable than failing to exercise, despite buying all the shit necessary to do so? I was very bad at running when I was a kid, and my gym teachers had no time for me. I wish someone had explained to me that I was exerting all of my energy in the initial sprint, that I could conserve that if I really tried. Also, maybe, that I'd need to actually practice running more than once a year to be any good at it.
The thing that finally turned me around was Couch to 5k, the standard for beginner running. I still can't run without music so I'd say that was a big factor as well. Thanks Ellie Goulding!