Have just done C25K w2r2 and my knees hurt! I seem to get different niggles each run. This is what put me off in the past, but I have already discovered running works wonders for my mood (I have anxiety) and I want to get fitter, so I'm determined to continue. I currently weigh 14st3lb and my BMI is around 34, so I am obese. Could my weight be part of the problem? Have seen on other threads that heavier ladies are doing C25K too, so it should be possible? I wear off the shelf Karrimor running shoes, so not great but not the worst either.