Lunch run. Breathing and energy still get out of whack during the 20-40 minute mark of every run. I tried focusing on relaxation, belly breathing, and respiration rate. The easiest solution I've found is taking a 60 sec. walk break around the 30 minute point. Feels like my heart resets and I can then breath and run more freely afterward. Now I wonder if this walk break will become a permanent part of my running?