I went out this morning to do W1R2 of the Bridge to 10K programme 4x10 minutes with 1 min walk between. I had done the identical W1R1 before - but had gone at it like "a bull in a china shop" as I usually do, managed to finish it but only just. This time I was determined to do it slowly - an "easy" run - I will talk to my imaginary friend as I do it.
I took my heart rate monitor with me - had not been using it much - but wanted to keep my HR down to around 70% of my max. All went OK for the first 2 repeats 22 minutes - and then I noticed something - I had not really realised it , but in my attempt to run slowly , easily and without breathing hard , I had started out breathing in and out through my nose only and I was still doing it after 22 minutes. I continued on nose breathing - and whenever I started to feel like I would like to start breathing through my mouth, I slowed down a bit and once again the nose breathing was OK for me.
It's almost like using my nose as a "steam control valve" . I do recall being told to breathe in through my nose in the early part of the C25K programme - and basically refused to do it. Perhaps I am now seeing why they said to do it??? To slow us down so we could easily finish the task at hand??