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I've been following a myasics program for a 1/2 marathon on 29th March, for the last 3 weeks I've had a 15km run on Saturdays, then it changes with the longest run of the week being 8km on a Thursday and 30 and 40 minute runs on Satuday and Sunday.
After this I go back to long runs on Saturday (105 minuts for 3 weeks).
Is is usual to have a break from the long runs - mind you 3 months ago 8km was a LONG run