reporter peter viles is an active marathon runner and attempted a 20 kilometer test but he weighs 25 kill. grams more than keep an says he's running technique is different to professionals on the test run his feet in tendon started to early on after 10 kilometers he had to give up because he can't even drive here for you can see doing 345 kilometer runs with issue but i recommend that amateurs who want to do a marathon train sufficiently. and explicitly train with the shoe to prepare. because the shoe affects the legs calf muscles very differently and. if you want to keep up even as an amateur you may need to really learn how to run nike's competitors are announcing models similar to the vapor fly the big money of letting the powerful firms are betting that the rule makers of track and field will side with them and allow the new shoot technology. you're watching news life business asia coming up next with more on call us guns escape from japan and don't forget you know he's got all the latest news and information around the clock on a website that's beat up any dot com and you can sp