I need a fall sport to do, and have been looking at cross country. Our school's head coach is saying that I should do it to keep in shape and that it will make me better at the 400m, but our sprint coach says that cross country makes you a slower sprinter and that it will take some of the "spring" out of my sprinting ability.
What are all your opinions? (I also run the 100 and 200, in addition to the 400, and have even been known to do hurdles…)