I feel that a form of cardio (in this case, running) is essential to any exercise routine, regardless of one's goal. I'm not sure of a few specifics, but for me, running keeps me feeling live and better in weightroom. I don't do long distance runs by any means. My everday cardio routine consists of two miles, one of which I spring the straights and jog the curves of my track.
However, my opinion does differ considering drinking a pre-run protein shake. In my personal experience, drinking a protein shake before running has actually impeded my ability to finish cardio with full strides. Myself, I drink only and simply water before, during, and after cardio. I only drink protein before and after I actually lift.
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