In a move to limit athletes' exposure to severe heat, the 2020 Tokyo Paralympic Games marathon will start at 6:30 a.m., half an hour earlier than originally planned, sources revealed Monday.The International Paralympic Committee had initially approved a 7 a.m. start, but a working group set up to re-examine issues related to the heat determined temperatures could be high enough to warrant concern for the health of athletes.The Paralympic marathon is scheduled to take place on the final day of the Aug. 25 to Sept. 6 games. Races will be held in five athlete classifications.The course will be…READ FULL ARTICLE