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Any advice would be appreciated. I have run 4 marathons but failed to break 4 hours in each - PB is 4h15m.
My PB for the Half is 1h43m. In training I run around 40 miles a week, in 5 sessions; 1 long slow run per week, top 5 long runs adding up to 90 miles; 1 lactate threshold run a week (5 to 10 miles) at sub 8' mile pace; 1 set of intervals a week (eg 10 x 800 or 4 x 1m, at 7' mile pace); 2 easy jog days.
I am getting slightly quicker with each marathon, but nowhere near a sub-4 h. Usual tail-off in last 6 miles. Given my Half M time I should be well under 3h50....what am I doing wrong?