Not sure how many endurance running fans are on this forum but it's now been announced that the Nike Breaking2 project will have their sponsored runners make the attempt on the F1 circuit at Monza.http://news.nike.com/news/breaking2-monza
There are 2 other sub 2 hour projects out there. Adidas calls theirs Sub2, and another non-shoe company related effort called Sub2HR. They're all trying to maximize everything from the footwear, to hydration/fueling, to course and conditions.
Adidas has had their runners running in the shoe for their effort for a couple of months, but Nike has just shown theirs today. They're goofy as hell but they claim that the extra bulk at the rear is for aero purposes.http://running.competitor.com/2017/03/n ... hon_162689
FWIW the current record for the marathon is 2:02:57 held by Dennis Kimetto. To take almost 3 minutes off the current record a runner would have to run at an average pace of 4:35/mi (2:51/km) which would mean about 9:20 per lap at Monza (2.4km)