Seriously mate? wrote:
Better title would be "2:09 Adidas sponsored runner Herpasa Negasa wears Vaporflys and runs a 4% PR of 2:03"
6 minute PR**
How is this possible, I thought the Adidas boost midsoles literally stored energy in those TPU balls to fire it back into each running stride when the foot left the ground. The Adidas advert had those ball bearings bouncing off the boost foam multiple times to show the energy return compared with other midsoles. Surely that would work better than a carbon plate?!
I guess I was more suckered by the Adidas marketing campaign...