stride lenght+stride frequency+ana.endurance=sprinting. i still dont think bolt is an icon. ben was alot shorter than bolt and honestly ben would have been just as or if not faster then bolt!
WHY? track surfaces have changed ie…mondo surfaces
design of spikes have increased significantly and r more stiffer plates
supplements have changed LOL
although coaching has not changed alot therapy etc has changed with the introduction of newer recovery aids…