Hi all, I have just completed the third run of week 6, i.e. 25 mins without a break. For some reason I found it very hard going.... mostly within the first 10 minutes of the run. Why is it that sometimes it is really hard going and at other times it seems to go smoothly? Could it be a factor of something I've eaten or the weather even? I completed the run and feel good about myself, but if anyone has any tips on why this is and how to avoid it, that would be really helpful. Thanks.