43 break 4:00 mile BU Valentine

Nobody cares. It's not impressive anymore. You're username is about as relevant a sub5miler. You're just average these days.

I agree its not impressive. I'm just responding to all these people saying its just the shoes, its double threshold, its BU... Saying that the mentality of it not being thought of as this huge barrier anymore is why more people are doing it.

I've done careful numerical analyses of this phenomenon before, but one key is that with the additional eligibility runners there was far more competition for the 16 spots in the mile, and so forth, leading to a lot more paced time trials and racers at those meets, many of whom go to the same spots to get the best pacers and competition, UW, Ark, and esp. BU.

More competition? Same number of scholarships and roster spots.

training begins much earlier than it used to. but there's a caveat. for every high schooler who breaks 4 minutes, there's dozens who get injured from overtraining to achieve something their body isn't ready for.

like in baseball how Tommy John surgery used to be something only pros needed. now you hear stories where little leagers are having it from overthrowing.

It is the shoes! Its only a matter of a couple of years if that, a sub 4 mile will be a solid 5,000m pace!

How so? The shoes already exist.

Do you think shoe tech has peaked? The mechanical advantage will only increase.

E. All of the above.

Much smaller improvements coming. Governing bodies are limiting changes.

Until times stagnate - then the limits will be removed.

Then there will be a new round of “better training and better nutrition”