I've just come back from my 4th Park Run and although my time has improved week on week, I'm still finding I can't run for anywhere near 30 minutes straight, although I go out for consolidation runs twice a week and manage 30 minutes every time - I won't say 'with ease' because it's not easy but at Park Run it just seems impossible to keep going. There are 3 long but reasonably steady and not too steep inclines along the route, and a couple of downhill stretches (again quite gentle) and the rest of it on the flat, but I just can't seem to keep going. It's not that I'm hemmed in by other runners - I do the first 5 minutes as a warm-up walk, so by the time I start to jog I'm one of the stragglers at the back. I have the W9R3 audio playing, and my normal music playlist that accompanies me on my consolidation runs so I just don't know why I can't run for 30 minutes. Any ideas?