Just started the couch to 5K. Just completed the 2nd run of week 2. Doing OK but the tip on breathing is so difficult for me. It instructs you to breathe in for the count of 4 and out to the count of 4 in rhythm to your left foot hitting the ground. I can only count to 2 before I need to breathe, is this something that will come in time or am I doing it wrong?