i don't really know the answer to your question...however, i strongly suggest that you add some HIIT into your running program. I obviously have no clue whether or not you play sports, but either way, definitely add HIIT to your running program. how often, unless you run XC, are you going to run for 40 minutes in a row? HIIT will increase your speed and your endurance for sprints. stick with the running, but i strongly suggest that you add HIIT and other sprint work to your program.
there's my 10 cents, my 2 cents is free
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