Tokyo track designer reveals boost from new surface as records fall at Olympics

Andrea Vallauri says new surface enhances performance by 1-2% Karsten Warholm shreds men's 400m hurdles world record The designer behind the lightning fast Olympic Stadium track in Tokyo has said it gives a 1-2% performance advantage to athletes, making it the quickest in history. Super spikes, hot weather and the track have all been cited as contributing to a number of sensational times, with the Norwegian Karsten Warholm becoming the latest to leave jaws dropping by breaking the 400m hurdles w...