Went back to week 6 run 3 because I've been failing at week 7. (Of course, then I realised they're the same - 25 minutes.)
But it was all a bit irrelevant because I only managed 12 minutes before having to stop. My calf muscles felt like concrete instead of stretchy elastic. Dammit! I feel like I'm never going to get past week 6/7 and get to the end.