YC93

Hi, I hope you can help me. I usually run on my treadmill. When I decided to make it more seriously, I started with breathing excercises. Strangely, I only felt comfortable with a 3/6 breathing, then 3/5, but I can't manage to do a more normal pacing. I thought that was ok as long as I could still run, but this last exercise I began to gasp. I don't know if it was because I was running faster or because of my breathing. What should I do?