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I'm doing a very hilly marathon and have been advised by several people that walk-running is the sensible option to avoid 'blowing up.' I have never walk-run before but the terrain is so unremittingly steep that it does make sense. However, since I've never walk-run as a strategy before, I have no idea how to divvy up the time - walk up the steepest hills and then run? Or work out a ratio and stick to it or just make it up as I go along?
In training I have included half to 3/4 of the entire vertical ascent in my long runs and will do the entire vertical ascent this weekend - and that's running, not walking.