I completed C25k last year, using the NHS podcast that works you up to running for 30 min. Since then I run twice a week or so, starting and ending with a 5 min walk and running for 30 min in the middle.
My struggle is that I'm VERY slow and don't seem to be getting any faster. Over Christmas I took the time to do a couple of runs that were actually 5km and it took me 50 mins! On my regular runs I struggle to get my average time per km below 10min.
My stamina seems to be ok, as running for 50min didn't seem that hard even though I'd never done it before - I could just keep going. But how do I master going faster over shorter times?