I'll thank you now. I took this advice from you about a year ago and it transformed my attitude towards, and enjoyment of running.
I remember at a Parkrun, another member of my village running club came to me and started talking. I was going for my tenth successive PB, which I achieved, but I was putting in so much effort that I couldn't talk whilst I was running. Then I read this advice from you, and started running slower, and talked to myself occasionally to test I was going at conversational pace.
Ever since then, my endurance has been much better. I soon switched from 5k training runs to 10k training runs, and before long found them quite easy. A year later and my best distance is 20k, and my average run is 11k. It is more enjoyable, so I am motivated to run more often.
So thanks again
@Stuuuuuu, and I would recommend anyone to follow this advice if they are to maintain focus and enjoyment of running.