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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.
If you are starting out with a new exercise program or are a beginner exerciser, rest every third day (that is, exercise two consecutive days and rest the third). More experienced exercisers should remain inactive or t ake an active recovery day once a week.