Running a sub 4 hour marathon

Running a 4 hour marathon is my goal for the December 2016 Singapore Standard Chartered Marathon! I need to cut 47min 26sec from my previous best set in Dec 2014. It's quite a big margin and I need to run about 1 min 7 sec faster per km over the entire 42.195km. It's not a extremely fast time but my overall body fitness will need to be improved to take the pounding better during the race. 

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