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I have just completed a sub 20 minute 5k challenge and I have a personal challenge to break 40 minutes for 10k, which I think will happen naturally this year.
So I've started a thread, which I believe, is a really really hard challenge. No time limit attached as it is really difficult to know if I will ever be able to run this fast.
My current PB for 5k is 19:31 which I achieved last Saturday.
In the other threads the advice I've received has been invaluable and any further advice in this thread is welcome.
Almost impossible to imagine I will ever be able to run at sub 5:27m/m for 3.1 miles.