I've been realizing recently it's very interesting how rare it is for someone to be super dominant in running. Usain Bolt, Kenenisa Bekele, David Rudisha before his injury. Genzebe Dibaba who is a supreme talent has had problems maintaining her form throughout the season. Her sister Tirunesh didn't seem to have this problem. It makes me wonder what is the difference in the training or physically that makes that happen. What exactly is the problem? Leonel Manzano is another good example of a great runner that has a problem maintaining his form through the season, but ran excellent today. All thoughts appreciated. Thank you.