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In the fast finish long run, start by running just the last three to five miles fast and on each successive fast finish long run, increase the distance of the fast part so that 3-4 weeks before your marathon, you run a 20-22 miler with the last 9-12 miles at a faster and faster pace.ow to Implement. While I recommend a two-hour long, steady run virtually year round for most runners, you should not start the fast finish long runs until 8-10 weeks before the marathon. Too many of these workouts and you will peak too soon and be flat by marathon day.
By week 20, your long run is closer to 16 miles...do not exceed this distance...start working on speed. Once you are confident you can complete the marathon distance (if you can run 16 you can throw in another 10 at an all day pace) then work on speed. This is just a rough plan.