15-year-old becomes youngest to run sub-4-minute mile

[Mosby]

New Zealand's Sam Ruthe has made history by becoming the youngest athlete and the first 15-year-old to run a mile in under four minutes, breaking the record by two seconds Wednesday at Mount Smart Stadium in Auckland.

The middle-distance prodigy completed the race in 3 minutes, 58.35 seconds, with pacemakers Sam Tanner and Ben Wall also finishing within the four-minute mark.

"This was probably my favorite goal that I've reached. I've definitely enjoyed this one the most, with all the people here supporting me," Ruthe said. "This has been the most set up for me, so I'm really happy to have gotten this one."

https://www.espn.com/olympics/story/_/id/44314922/15-year-old-becomes-youngest-run-sub-4-minute-mile

[Jim__]

1. Before Bannister broke the 4-minute mile, most people thought it was impossible.

From ImpossibleHQ:

Sir Roger Bannister was the first man to run a mile in under four minutes. Up until he did it in 1954, most people thought the four-minute mark was impossible to break. They thought the human body couldn’t physically go that fast – that it would collapse under the pressure.

No-one could run a mile in less than four minutes.

It was impossible.

You were crazy to even try.

[stoned]

2. Human beings are amazing.

[Bayard]

3. Outstanding, young man!

Hope to see you at future Olympics.

[ProfessorGAC]

4. At 15!

In the pics I could find, he looks pretty tall.
So, I think strength & training is more his ticket to further improvement, not a longer stride from height.
But, I don't know how much growth is required for substantial improvement in speed. Might be more than I think.