now 4 days away from entering BRNC, can just about make the 1.5mile time, but everynow and then, and recently more frequently, i get a stitch around a quarter of the way through which i imagine is slowing me down somewhat. obviously im desperate for this not to happen during PT-A, so my questions are... what is a stitch? How do they happen? How can i prevent them? thanks for any advice, other than bricking it about fitness (my own fault, ive been busy but should have found more time for it) im getting pretty nervous, cant believe its finally happening!