I've got Leeds half marathon later this year and I've been putting a training schedule together which starts in a couple of weeks. the thing is, on a couple of the Sundays during the schedule where there should be a long run, I've got 10k's to race instead. the question I wanted to ask is this: is a 10k a suitable replacement for the long sunday run or would you still try to get the long run elsewhere in the week? How does everybody else manage their races and training? I'm thinking of how to maximise my 10k's without affecting the half marathon programme.