And those already. but these friends are a little bit trickier to quantify, we don t have as much data on that. even some of the sprinters like the 500 metre hurdles was not wearing this next generation of spikes. his work much closer to the older spikes that we know. there are other factors going older spikes that we know. there are otherfactors going on. the heat in tokyo might be slightly advantageous for some of the sprinters. but the track, that s one of the things a lot of the athletes are talking about, it has more rebound to it. so the same thing that had the shoes beneficial artists under the feet of the applet. ifigure it s the applet. i figure it s starting to understand how we can use the mechanical interface of the ground, how we interact with the ground to speed up time a little bit more. jeff, so interesting to talk to. but definitely against issues, i ve had to say. he s made that point very clear. there is no shortage of other record breaking action either the skateboa ....