Would 400m and 800m repeats (once a week for each) along with one longish (20 min) Crossfit metcon each week be sufficient? And throw in a 5k every 4 weeks to gauge progress...
Despite the fact that I am running a 5k (it's fundraiser for the booster club), I'm not overly fond of running long distances. Getting a good time on a steady diet of 400s and 800s would be pretty satisfying...
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