The Faith Kipyegon sub 4 thing had a lot of issues, but a main takeaway is that sub 4 by a woman is still a long way off. So what are the biggest realistic barriers in athletics that are yet to be broken?
My pick is probably the sub 2 marathon in a legal race. Kipchoge's sub 2 was incredible and proved it was possible. Kiptum was on track to probably break 2 by now. But right now I don't think there's someone out there really knocking on the door. Maybe Kiplimo? This barrier is especially relatable to the average fan as it's a round number.
Sub 1:40 in the 800m seems maybe possible eventually. I don't really see a sub 3:40 mile being run any time soon. Sub 12:30 in the 5k may be possible and is a nice round number considering it's exactly 60 seconds per lap.
For the women, there aren't may round numbers they're knocking on the door of. 14 and 29 were recently broken. 2:10 was recently broken. Sub 1:50 seems pretty unrealistic right now. Maybe 3:45 for the 1500m is eventually doable but even that seems potentially decades away. the best one I can think of is maybe if Sydney can run under 50 for the 400mh.