My 4th Park Run and my 2nd after IC for 1 month and I got a PB of 35.21 I don't feel as happy with that as I actually walked for about 30 secs 3 times. I think the problem was I set off with faster runners and therefore ran faster and tired myself more. I felt happier last week when I ran the whole thing in 36.55. Is it better I run faster and walk a bit like today, or slower and don't walk at all like last week? I presume running faster is getting me to improve my fitness?