http://japanrunningnews.blogspot.com/2014/03/toyo-university-spends-50000-on-new.html
Toyo sprint coach Michiaki Kajiwara explains: “This track allows you to learn how to move your legs and contact the ground at 9-second speed. The 1% slope is the key. If the slope is too severe it will alter the athlete’s running form on flat ground”