I am really enjoying this plan.. Finding it tough but have achieved all the weeks.. Until now!! Struggling at Week 7!. I managed the 25 min run week 6 run 3. Last week (week 7) I couldn't get past 20-21 mins so I walked for a minute then managed to finish the run. So I decided to repeat week 7. Run 1 I struggled again at 20 mins so walked for one min then ran for a further 5 with no problem. Why am I flagging at 20 mins.. Don't really want to repeat wk 7 for a third time!! I am running slowly so slowing down not really an option! I will preserve as I am determined to finish the plan! Any advice welcome.. Thanks.