I have been running for the past two months on the C25k plan and up until now have been fine. Had to abort todays run though because half way through (14 mins) was struggling to breathe and my legs seemed to give up completely! Will try again in a couple of days but has anyone else experienced similar pitfalls? I'm 22 and of reasonable health, mad at myself for not continuing today but I seemed to pass a threshold. Any suggestions?