I often wondered why people did these self-evidently unfun things, purportedly "for fun".
I will say that now that I am getting older its getting a bit tougher - the pain is worse and lasts longer and real chronic pain kind of bums me out, but I just enjoy the challenge of trying to work around my body.
Please see this as your body trying to tell you something before you end up with a bad injury that could prevent you from running for weeks.
For me, shin splits subsided after I got more comfortable running shoes and shortening the distance covered during runs (i.e. ~5km down to ~3km, 5-days a week).
I’m a big Type II fun person and feel that there are all sorts of highly satisfying life experiences to be had if you’re able to tolerate some discomfort, but there has to be some deliberate practice of getting comfortable being uncomfortable to ease into it.
Plus of course the chance to humble brag online afterwards!
I mean it's not for me but I can see how in hindsight (it's always in hindsight, never in the moment) it'll be considered fun. Or at the very least a story to share with friends or the internet, which is also fun.
