https://imgur.com/a/yB0fMn4
The whys and wherefores of this are certainly strange.
Fantasy option 7 for your list is "Because they're one of us and are loving every second of it!" but that's extremely unlikely wishful thinking lol, although certainly not entirely impossible.... (I can dream, right?)
Many of these girls don't just dribble or spurt a bit, they all out soak themselves, a lot. The wet patches are often way up the front of their bikini panties (TIL runners call them "buns" or "bun huggers" lol).
Mostly they're distance runners but even the 10000m only takes around about half an hour to complete. It's unlikely they're filling their bladders to capacity in just the race time alone. A lot of these girls run the 1500m which is over in just about 4 minutes. Even if you're on track for 10 minutes before and after, you're still less than 30 minutes in the arena...
My best bet is that runners wetting themselves is a mixture of hydrating heavily, pre-race warm up and mental routines that don't necessarily allow for a last minute bathroom break and a combination of basically all of your options but mostly stress incontinence.
The wettings always seem to happen at the very end of the race, when distance runners give their absolute all and will be hitting the ground with the most impact. If somebody were prone to stress incontinence, that would be the most likely moment for an accident. Add in excitement, focus, adrenalin, anxiety, a filling bladder because of all that gatorade, and the fact that no elite athlete is ever going to let a little thing like pee get between them and winning and you've got a recipe for wet buns... and long may it continue


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