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I am doing the VLM this month and yesterday was my last big long-run - a 21 miler.
I have run 20 miles three times in the trainging schedule I am following and managed it fine each time (coming in around 3hrs).
However yesterday I massively hit the wall at 18-19 miles which has scared the hell out of me. Energy levels dropped hugely and hips, legs, knees, feet - everything started to hurt badly.
The only thing different were that it was warmer than it usually is when I run my long runs - i drank about half a bottle of Lucozade during the run which is a little bit more than normal but not much. I had two energy gels too - the normal amount for anything over 15 miles.
Any ideas as to why I crashed so badly? I am concerned now for the big day - I managed the last two miles at a proper snail's pace - 12 minute miles or so but I had nothing left in the tank at the end.
My taper starts now so I should recover by the time the big day rolls round. I am training five days a week and have been since Jan (i am following the sub 4hr schedule that RW recommended on here).
Any help or advice would be massively appreciated.