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Wonder if anyone can advise me? I am a fitness instructor and teach 22 classes per week (all sorts- kettlebells, body pump, spin, everything!!) so have a pretty good base level fitness. I recently ran my first half in 9 years in 1.44 with only one training run a week (of 8-12 miles) for 8 weeks - my previous pb was 1.50 before I was a fitness instructor, so my job has definitely helped make me faster!
However, given the amount of exercise I already do, I can't fit in the 40 or so miles a week I need to do a full marathon, which is my next goal for this year (prob the New Forest in September - have run it twice before and loved it!) - what do you think I can get away with as a bare minimum to get me round in sub-4 without too much pain? Do you think 25-30 per week is enough (split over one long and two short runs)?? Or am I kidding myself that all the cross- training will work, and it really boils down to time on feet at this distance? Any advice gratefully received!