I'm doing this programme to build stamina after having a horrible back for years when my muscles turned into so much jelly, and I'm really scared of doing too much too quick now. I peched and panted my way through W4, wondered if I should repeat a run and then thought no, enough of the W4 music, I'll do W5R1 and I can repeat that. Went out this morning thinking, I won't make this, I don't even want to be here, why am I doing this - and it was the best run I've had I think. Even managed a slight speed-up when Laura said 1 more minute. But now I'm really unsure what to do - should I repeat this run, maybe going for a bit more speed in the walking sections, or should I crack on with W5R2? The music was quite nice today, seems a pity to waste it and I don't want to do too much - any others running after back trouble who could advise?