Hello.
I'm fortunate that Coach O'Malley has shared his outdoor track training with
https://highschoolrunningcoach.com/
The following document is for members only, but it seems important to share it for free here.
https://highschoolrunningcoach.com/wp-content/uploads/2016/06/OMalley-TrainingOverview.pdf
Check out #4 on the document - "Our feet move fast every day."
If more American HS coaches adopted this there would no doubt be more sub 1:50 male 800m runners. Yes, the twins he coaches are special, but - in my humble opinion - there is often a disconnect between building the aerobic engine and having a great neuromuscular system. If you're a HS coach out there, perhaps you should as yourself - "It's July 1st - are my athletes moving their feet fast every day, given that school starts in 6-7 weeks?"
If you want to listen a podcast with Coach O'Malley, check out this short podcast.
http://www.coachjayjohnson.com/2016/07/podcast-027-john-omalley/
Again, so lucky that Coach O'Malley was willing to share all of his outdoor track training with HSRC. Thank you John!