I have found the C25K+ Stamina podcast quite useful in keeping me going in my Parkrun quest for a time starting with 3 rather than a 4. I have to get it started straight after pressing the stopwatch button on my Tomtom - I usually fail with one of them but yesterday it was the podcast itself that was the problem. It ran fast, rather like a 33 rpm record (if you remember them) set to play at 45 rpm. So Laura's pacing - 1,2,3,4 - was more than a little beyond my ability to keep up (and she sounded a bit frantic too). The outcome was not good at 41+ min.
I have no idea why this happened. Has anyone else come across this phenomenon with any podcast?