Organizers of the Tokyo 2020 Olympics have decided to move up the start time of the men's and women's marathons from 7 a.m. to 6 a.m. over concerns of extreme heat, an informed source said Monday.A 5:30 a.m. start had also been proposed, but was rejected due to the difficulties spectators would have getting to the marathon route in time and the negative effect it would have on television broadcasts.On Saturday, while the International Olympic Committee's Executive Board met in Tokyo, a panel formed to propose solutions to the issues weather may pose for the summer games suggested 5:30 a.m. …READ FULL ARTICLE