I went to my local parkrun for the third time this morning (although only my second run/walk as last time I was volunteering as Tailwalker). I had planned to do my next re-run (week 6 run 3 - 25 mins) and then walk the rest.
I walked the first 5 minutes as my warm up, then started running. However after about 5 minutes, I was really finding it hard to breathe, so stopped to walk (and as my breathing didn't start to settle, used my inhaler to help). So changed my plan to a run/walk. This parkrun is 2 3/4 loops going downhill and then back up (just a gentle slope) with a flat bit at the top and bottom, so I ran the downhill and most of the flat sections and walked the uphill section. I used my Garmin watch to record just the running sections, and they totalled about 3km, so I ran more than I walked.
And the best bit was I took 1 1/2 minutes of my previous time - a new PB!
(and I can do week 6 run 3 another day!)