The first day of C25K I had to find a comfortable breathing technique. It's cold here in Orlando at the time it was 50 something degrees. Which from my point of view made it a little harder to breathe properly. But as I kept pushing breathing got easier and the jogging did as well.
The second day, which is today on the 23rd, the first jog I did was easy then the second jog I had to find a proper breathing technique as my heart rate increased. It was 43 degrees and I exercise in the morning at 5:00. I'm hoping day 3 goes pretty smooth as I transition to week 2.