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On rest and recovery days it is important to avoid doing the worst thing you can do for your body... nothing. Examples of rest and recovery activities are walking, static stretch exercises (after a warm up and loosening up period), dynamic stretching, swimming, water running, and riding a bike.
-For longer term Active Recovery..walk on the days you don't run (remember we don't run every day), just a light walk not a power walk, this improves blood flow on your rest day, or cycle, just around a few blocks, to keep blood flowing through those legs.