Getting into a running groove is good. It's good for your heart, it establishes a nice rhythm...but it won't help if you're scouting food & supplies in a post-apocalyptic scenario. Here, it's more important to be able to run, stop, forage, run, pick up a can of meat, run, pick up a chainsaw, run, stop, dismember a zombie...and so forth.
Russ Craber, MBA, CSCS, has always been concerned about a post-apocalyptic zombie scenario, and can train you for optimal living after the inevitable occurs. You would be well-advised to heed his advice.